900 (number)

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900 (nine hundred) is the

• A telephone
  area code for "premium" telephone calls in the North American Numbering Plan (900 number)^[1]
• In Greek number symbols, the sign Sampi ("ϡ", literally "like a pi")
• A
  skateboarding trick
  in which the skateboarder spins two and a half times (360 degrees times 2.5 is 900)
• A 900 series refers to three consecutive perfect games in bowling^[2]
• Yoda's age in Star Wars

Integers from 901 to 999

900s

• 901 = 17 × 53, centered triangular number, happy number
• 902 = 2 × 11 × 41, sphenic number, nontotient, Harshad number
• 903 = 3 × 7 × 43, sphenic number, triangular number,^[3] Schröder–Hipparchus number, Mertens function (903) returns 0, little Schroeder number
• 904 = 2³ × 113 or 113 × 8, refactorable number, Mertens function(904) returns 0, lazy caterer number, number of 1's in all partitions of 26 into odd parts^[4]
• 905 = 5 × 181, sum of seven consecutive primes (109 + 113 + 127 + 131 + 137 + 139 + 149), smallest composite de Polignac number^[5]
  • "The 905" is
    overlay plans
    added two more area codes.
• 906 = 2 × 3 × 151,
  strobogrammatic
  , sphenic number, Mertens function(906) returns 0
• 907 = prime number
• 908 = 2² × 227, nontotient, number of primitive sorting networks on 6 elements,^[6] number of rhombic tilings of a 12-gon ^[6]
• 909 = 3² × 101, number of non-isomorphic aperiodic multiset partitions of weight 7 ^[7]

910s

• 910 = 2 × 5 × 7 × 13, Mertens function(910) returns 0, Harshad number, happy number, balanced number,^[8] number of polynomial symmetric functions of matrix of order 7 under separate row and column permutations^[9]
• emergency telephone number
  in North America
• 912 = 2⁴ × 3 × 19, sum of four consecutive primes (223 + 227 + 229 + 233), sum of ten consecutive primes (71 + 73 + 79 + 83 + 89 + 97 + 101 + 103 + 107 + 109), Harshad number.
• 913 = 11 × 83, Smith number,^[10] Mertens function(913) returns 0.
• 914 = 2 × 457, nontotient, number of compositions of 11 that are neither weakly increasing nor weakly decreasing ^[11]
• 915 = 3 × 5 × 61, sphenic number, Smith number,^[10] Mertens function(915) returns 0, Harshad number
• 916 = 2² × 229, Mertens function(916) returns 0, nontotient,
  strobogrammatic, member of the Mian–Chowla sequence^[12]
• 917 = 7 × 131, sum of five consecutive primes (173 + 179 + 181 + 191 + 193)
• 918 = 2 × 3³ × 17, Harshad number
• 919 = prime number, cuban prime,^[13] prime index prime, Chen prime, palindromic prime, centered hexagonal number,^[14] Mertens function(919) returns 0

920s

• 920 = 2³ × 5 × 23, Mertens function(920) returns 0, total number of nodes in all rooted trees with 8 nodes ^[15]
• 921 = 3 × 307, number of enriched r-trees of size 7 ^[16]
• 922 = 2 × 461, nontotient, Smith number^[10]
• 923 = 13 × 71, number of combinations of 6 things from 1 to 6 at a time ^[17]
• 924 = 2² × 3 × 7 × 11, sum of a twin prime (461 + 463), central binomial coefficient ${\displaystyle {\tbinom {12}{6}}}$^[18]
• 925 = 5² × 37, pentagonal number,^[19] centered square number^[20]
  • The
    millesimal fineness number for Sterling silver
• 926 = 2 × 463, sum of six consecutive primes (139 + 149 + 151 + 157 + 163 + 167), nontotient
• 927 = 3² × 103,
  tribonacci number^[21]
• 928 = 2⁵ × 29, sum of four consecutive primes (227 + 229 + 233 + 239), sum of eight consecutive primes (101 + 103 + 107 + 109 + 113 + 127 + 131 + 137), happy number
• 929 = prime number,
  Eisenstein prime
  with no imaginary part
  • An
    area code in New York
    .

930s

• 930 = 2 × 3 × 5 × 31, pronic number^[23]
• 931 = 7² × 19; sum of three consecutive primes (307 + 311 + 313); double repdigit, 111₃₀ and 777₁₁; number of regular simple graphs spanning 7 vertices ^[24]
• 932 = 2² × 233, number of regular simple graphs on 7 labeled nodes ^[25]
• 933 = 3 × 311
• 934 = 2 × 467, nontotient
• 935 = 5 × 11 × 17, sphenic number, Lucas–Carmichael number,^[26] Harshad number
• 936 = 2³ × 3² × 13,
  pentagonal pyramidal number,^[27]
  Harshad number
• 937 = prime number, Chen prime, star number,^[28] happy number
• 938 = 2 × 7 × 67, sphenic number, nontotient, number of lines through at least 2 points of an 8 × 8 grid of points ^[29]
• 939 = 3 × 313, number of V-toothpicks after 31 rounds of the honeycomb sequence ^[30]

940s

• 940 = 2² × 5 × 47, totient sum for first 55 integers
• 941 = prime number, sum of three consecutive primes (311 + 313 + 317), sum of five consecutive primes (179 + 181 + 191 + 193 + 197), Chen prime, Eisenstein prime with no imaginary part
• 942 = 2 × 3 × 157, sphenic number, sum of four consecutive primes (229 + 233 + 239 + 241), nontotient, convolved Fibonacci number ^[31]
• 943 = 23 × 41
• 944 = 2⁴ × 59, nontotient, Lehmer-Comtet number^[32]
• 945 = 3³ × 5 × 7,
  primitive semiperfect number;^[36] Leyland number^[37]
• 946 = 2 × 11 × 43, sphenic number, triangular number,[3] hexagonal number,^[38] happy number
• 947 = prime number, sum of seven consecutive primes (113 + 127 + 131 + 137 + 139 + 149 + 151),
  Eisenstein prime
  with no imaginary part
• 948 = 2² × 3 × 79, nontotient, forms a Ruth–Aaron pair with 949 under second definition, number of combinatory separations of normal multisets of weight 6.^[40]
• 949 = 13 × 73, forms a Ruth–Aaron pair with 948 under second definition

950s

• 950 = 2 × 5² × 19, nontotient,
  generalized pentagonal number^[41]
  • one of two ISBN Group Identifiers for books published in Argentina
• 951 = 3 × 317, centered pentagonal number^[42]
  • one of two ISBN Group Identifiers for books published in Finland
• 952 = 2³ × 7 × 17, number of reduced words of length 3 in the Weyl group D_17,^[43] number of regions in regular tetradecagon with all diagonals drawn. ^[44]
  • 952 is also
    9-5-2, a card game similar to bridge
    .
  • one of two ISBN Group Identifiers for books published in Finland
• 953 = prime number, Sophie Germain prime,[45] Chen prime, Eisenstein prime with no imaginary part, centered heptagonal number^[46]
  • ISBN Group Identifier for books published in Croatia
• 954 = 2 × 3² × 53, sum of ten consecutive primes (73 + 79 + 83 + 89 + 97 + 101 + 103 + 107 + 109 + 113), nontotient, Harshad number, sixth derivative of x^(x^x) at x=1.^[47]
  • ISBN Group Identifier for books published in Bulgaria. Also one of the
    South Florida
    Area
• 955 = 5 × 191, number of transitive rooted trees with 17 nodes
  • ISBN Group Identifier for books published in Sri Lanka
• 956 = 2² × 239, number of compositions of 13 into powers of 2.^[48]
  • ISBN Group Identifier for books published in Chile
• 957 = 3 × 11 × 29, sphenic number, antisigma(45)^[49]
  • one of two ISBN Group Identifiers for books published in Taiwan and China
• 958 = 2 × 479, nontotient, Smith number^[10]
  • ISBN Group Identifier for books published in Colombia
  • The
    millesimal fineness number for Britannia silver
• 959 = 7 × 137, composite de Polignac number[50]
  • ISBN Group Identifier for books published in Cuba

960s

• 960 = 2⁶ × 3 × 5, sum of six consecutive primes (149 + 151 + 157 + 163 + 167 + 173), Harshad number
  • country calling code for Maldives, ISBN Group Identifier for books published in Greece
  • The number of possible starting positions for the chess variant
    Chess960
• 961 = 31², the largest 3-digit perfect square, sum of three consecutive primes (313 + 317 + 331), sum of five consecutive primes (181 + 191 + 193 + 197 + 199), centered octagonal number^[51]
  • country calling code for Lebanon, ISBN Group Identifier for books published in Slovenia
• 962 = 2 × 13 × 37, sphenic number, nontotient
  • country calling code for Jordan, one of two ISBN Group Identifiers for books published in Hong Kong
• 963 = 3² × 107, sum of the first twenty-four primes
  • country calling code for Syria, ISBN Group Identifier for books published in Hungary
• 964 = 2² × 241, sum of four consecutive primes (233 + 239 + 241 + 251), nontotient, totient sum for first 56 integers
  • country calling code for Iraq, ISBN Group Identifier for books published in Iran, happy number
• 965 = 5 × 193
  • country calling code for Kuwait, ISBN Group Identifier for books published in Israel
• 966 = 2 × 3 × 7 × 23 = ${\displaystyle \left\{{8 \atop 3}\right\}}$, sum of eight consecutive primes (103 + 107 + 109 + 113 + 127 + 131 + 137 + 139), Harshad number
  • country calling code for Saudi Arabia, one of two ISBN Group Identifiers for books published in Ukraine
• 967 = prime number, prime index prime
  • country calling code for Yemen, one of two ISBN Group Identifiers for books published in Malaysia
• 968 = 2³ × 11², nontotient, Achilles number, area of a square with diagonal 44^[52]
  • country calling code for Oman, one of two ISBN Group Identifiers for books published in Mexico
• 969 = 3 × 17 × 19, sphenic number, nonagonal number,^[53] tetrahedral number^[54]
  • ISBN Group Identifier for books published in Pakistan, age of Methuselah according to Old Testament, anti-Muslim movement in Myanmar

970s

• 970 = 2 × 5 × 97, sphenic number, heptagonal number
  • country calling code for Palestinian territories, one of two ISBN Group Identifiers for books published in Mexico
• 971 = prime number, Chen prime, Eisenstein prime with no imaginary part
  • country calling code for United Arab Emirates, ISBN Group Identifier for books published in the Philippines
• 972 = 2² × 3⁵, Harshad number, Achilles number
  • country calling code for Israel, one of two ISBN Group Identifiers for books published in Portugal
    • The Sum of Anti-Factors of 972 = number * (n/2) where n is an Odd number. So, it is a Hemi-Anti-Perfect Number. Other such Numbers include 2692, etc.

972 has Anti-Factors = 5, 8, 24, 29, 67, 72, 216, 389, 648

Sum of Anti-Factors = 5 + 8 + 24 + 29 + 67 + 72 + 216 + 389 + 648 = 1458 = 972 * 3/2

• 973 = 7 × 139, happy number
  • country calling code for Bahrain, ISBN Group Identifier for books published in Romania,
• 974 = 2 × 487, nontotient, 974! - 1 is prime^[55]
  • country calling code for Qatar, ISBN Group Identifier for books published in Thailand
• 975 = 3 × 5² × 13
  • country calling code for Bhutan, ISBN Group Identifier for books published in Turkey
• 976 = 2⁴ × 61, decagonal number^[56]
  • country calling code for Mongolia, ISBN Group Identifier for books published in
    St. Lucia, St. Vincent and the Grenadines, Trinidad and Tobago, and the British Virgin Islands
• 977 = prime number, sum of nine consecutive primes (89 + 97 + 101 + 103 + 107 + 109 + 113 + 127 + 131), balanced prime,[39] Chen prime, Eisenstein prime with no imaginary part, Stern prime,^[57] strictly non-palindromic number^[58]
  • country calling code for Nepal
  • EAN prefix for ISSNs
  • ISBN Group Identifier for books published in Egypt
• 978 = 2 × 3 × 163, sphenic number, nontotient, number of secondary structures of RNA molecules with 11 nucleotides^[59]
  • First
    EAN
    prefix for ISBNs
  • ISBN Group Identifier for books published in Nigeria
• 979 = 11 × 89, the sum of the five smallest fourth powers: ${\displaystyle 979=\sum _{n=1}^{5}n^{4}}$
  • Second
    EAN
    prefix for ISBNs. Also for ISMNs
  • ISBN Group Identifier for books published in Indonesia

980s

• 980 = 2² × 5 × 7², number of ways to tile a hexagon of edge 3 with calissons of side 1.^[60]
  • ISBN Group Identifier for books published in Venezuela
• 981 = 3² × 109
  • one of two ISBN Group Identifiers for books published in Singapore
• 982 = 2 × 491, happy number
  • ISBN Group Identifier for books published in the
    Western Samoa
• 983 = prime number,
  safe prime,^[61] Chen prime, Eisenstein prime with no imaginary part, Wedderburn–Etherington number,^[62] strictly non-palindromic number^[58]
  • One of two ISBN Group Identifiers for books published in Malaysia
• 984 = 2³ × 3 × 41
  • ISBN Group Identifier for books published in Bangladesh
• 985 = 5 × 197, sum of three consecutive primes (317 + 331 + 337), Markov number,^[63] Pell number,^[64] Smith number^[10]
  • one of two ISBN Group Identifiers for books published in Belarus
• 986 = 2 × 17 × 29, sphenic number, nontotient,
  strobogrammatic, number of unimodal compositions of 14 where the maximal part appears once^[65]
  • one of two ISBN Group Identifiers for books published in Taiwan and China
• 987 = 3 × 7 × 47,
  Fibonacci number,^[66] number of partitions of 52 into prime parts
  • one of two ISBN Group Identifiers for books published in Argentina
• 988 = 2² × 13 × 19, nontotient. sum of four consecutive primes (239 + 241 + 251 + 257). A cake number.
  • one of two ISBN Group Identifiers for books published in Hong Kong.
• 989 = 23 × 43, Extra strong Lucas pseudoprime^[67]
  • one of two ISBN Group Identifiers for books published in Portugal

990s

• 990 = 2 × 3² × 5 × 11, sum of six consecutive primes (151 + 157 + 163 + 167 + 173 + 179), triangular number,^[3] Harshad number
  • best possible VantageScore credit score
• 991 = prime number, sum of five consecutive primes (191 + 193 + 197 + 199 + 211), sum of seven consecutive primes (127 + 131 + 137 + 139 + 149 + 151 + 157), Chen prime, lucky prime, prime index prime
• 992 = 2⁵ × 31, pronic number,^[23] nontotient; number of eleven-dimensional exotic spheres.^[68]
  • country calling code for Tajikistan
• 993 = 3 × 331
  • country calling code for Turkmenistan
• 994 = 2 × 7 × 71, sphenic number, nontotient, number of binary words of length 13 with all distinct runs.^[69]
  • country calling code for Azerbaijan
• 995 = 5 × 199
  • country calling code for Georgia
  • Singapore fire brigade and emergency ambulance services hotline, Brunei Darussalam fire service emergency number
• 996 = 2² × 3 × 83
  • country calling code for Kyrgyzstan
• 997 = largest three-digit prime number, strictly non-palindromic number.
  lucky prime
  .
• 998 = 2 × 499, nontotient, number of 7-node graphs with two connected components.^[70]
  • country calling code for Uzbekistan

• 999 = 3³ × 37, Kaprekar number,^[71] Harshad number
  • In some parts of the world, such as the UK and Commonwealth countries, 999 (pronounced as nine, nine, nine) is the emergency telephone number for all emergency services
  • 999 was a London punk band active during the 1970s.

References

Wikimedia Commons has media related to 900 (number).