1868
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 23
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 5
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 3276
- Proper Divisor Sum (Aliquot Sum)
- 1408
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 932
- Möbius Function
- 0
- Radical
- 934
- Omega Function (Ω)
- 3
- Little Omega Function (ω)
- 2
Special
- Factorial
- no
- Catalan Number
- no
- Bell Number
- no
- Motzkin Number
- no
- Primorial
- no
Figurate Numbers
- Fibonacci Number
- no
- Triangular Number
- no
- Perfect Square
- no
- Perfect Cube
- no
- Pentagonal Number
- no
- Hexagonal Number
- no
- Lucas Number
- no
- Tetrahedral Number
- no
- Pell Number
- no
- Tribonacci Number
- no
- Pronic Number
- no
Recreational
- Happy Number
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 86
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- Prime Power
- no
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- yes
- Odd
- no
Appears in sequences
- Numbers k such that the k-th tetrahedral number is the sum of 2 tetrahedral numbers.at n=45A002311
- Smallest number of complexity n: smallest number requiring n 1's to build using +, * and ^.at n=20A003037
- a(n)=least number m such that m-a(n-1)<>a(j)-a(k) for all j,k less than m; a(1)=1, a(2)=3.at n=41A004979
- Record values in A005210.at n=47A005211
- Numbers not of form p + 2^x + 2^y.at n=44A006286
- Number of n-celled polygons with perimeter 2n+2 on square lattice.at n=7A006725
- Coordination sequence T2 for Zeolite Code ATT.at n=31A008042
- Coordination sequence T2 for Zeolite Code SGT.at n=27A008230
- Coordination sequence T3 for Zeolite Code SGT.at n=27A008231
- Coordination sequence T4 for Zeolite Code SGT.at n=27A008232
- Triangle T(n,k), n>=1, read by rows, where T(n,k) is the number of lattice polygons with area n and perimeter 2*k.at n=16A008855
- Phi(n) + 5 | sigma(n + 5).at n=25A015784
- Numbers k such that phi(k) + 10 | sigma(k + 10).at n=42A015789
- Numbers k such that the continued fraction for sqrt(k) has period 24.at n=26A020363
- Numbers k such that Fibonacci(k) == -3 (mod k).at n=26A023164
- a(n) = floor(floor(S3)/floor(S1)), where S3 and S1 are, respectively, the 3rd and first elementary symmetric functions of {sqrt(k), k = 1,2,...,n}.at n=27A025200
- Numbers k such that k^2 is palindromic in base 15.at n=31A030073
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 20.at n=44A031518
- "DHK" (bracelet, identity, unlabeled) transform of 1,1,1,1,...at n=16A032245
- Multiplicity of highest weight (or singular) vectors associated with character chi_158 of Monster module.at n=36A034546