15268
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 22
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 29232
- Proper Divisor Sum (Aliquot Sum)
- 13964
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 6920
- Möbius Function
- 0
- Radical
- 7634
- Omega Function (Ω)
- 4
- Little Omega Function (ω)
- 3
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
- yes
- Harshad Number
- yes
- Narcissistic Number
- no
- Collatz Steps
- 84
- 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
- Number of self-avoiding polygons of length 2n on square lattice (not allowing rotations).at n=8A002931
- Numbers k such that k*2^m-1 are composites for all exponents m in the range 0<=m<=k.at n=33A061154
- Structured triakis tetrahedral numbers (vertex structure 4).at n=21A100175
- a(n) = prime(prime(prime(A028815(n) - 1) - 1) - 1) - 1.at n=17A141133
- Row sums of triangle A178568.at n=22A169826
- Base-6 Keith numbers.at n=16A188197
- Number of length n+2 0..1 arrays with at most one downstep in every n consecutive neighbor pairs.at n=42A255993
- a(n) = A337339(n) - n.at n=44A337341
- Numbers that are the sum of eight fourth powers in seven or more ways.at n=34A345582
- Numbers that are the sum of eight fourth powers in exactly seven ways.at n=31A345839
- G.f.: Sum_{k>=0} x^(k^2) * Product_{j=1..k} ((1 + x^j)/(1 - x^j))^2.at n=23A376854
- G.f. A(x) satisfies 1/x = Sum_{n=-oo..+oo} A(x)^n * (A(x)^n + 5)^(n+1).at n=4A379205
- Expansion of Product_{k>=1} (1 + (2^k + 1) * x^k).at n=10A382976