15626
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 20
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 25284
- Proper Divisor Sum (Aliquot Sum)
- 9658
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 7200
- Möbius Function
- -1
- Radical
- 15626
- Omega Function (Ω)
- 3
- 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
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 40
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- yes
- 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
- a(n) = n^3 + 1.at n=26A001093
- a(n) = n^6 + 1.at n=5A002604
- Numbers that are the sum of 2 nonzero 6th powers.at n=10A003358
- Numbers that are the sum of at most 2 nonzero 6th powers.at n=16A004853
- Numbers that are the sum of at most 3 nonzero 6th powers.at n=36A004854
- a(n) = sigma_6(n), the sum of the 6th powers of the divisors of n.at n=4A013954
- Numerator of sum of -6th powers of divisors of n.at n=4A017675
- Expansion of Product_{m>=1} (1+q^m)^(-26).at n=4A022621
- Numbers k such that k^2 is palindromic in base 5.at n=17A029988
- Decimal part of cube root of a(n) starts with 0: first term of runs (cubes excluded).at n=23A034126
- a(n) = 5^n + 1.at n=6A034474
- Sum of cubes of unitary divisors of n.at n=24A034677
- Sum of sixth powers of unitary divisors.at n=4A034680
- Sums of two distinct powers of 5.at n=15A038474
- Numbers whose cube is palindromic in base 5.at n=7A046233
- a(n) = n*5^n + 1.at n=5A050916
- Sum of 6th powers of digits of n.at n=15A055015
- Sums of two powers of 5.at n=21A055237
- Numbers k such that k^4 == 1 (mod 5^5).at n=20A056102
- Numbers of the form (5^{mr}-1)/(5^r-1) for positive integers m, r.at n=11A076284