15507
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 22412
- Proper Divisor Sum (Aliquot Sum)
- 6905
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 10332
- Möbius Function
- 0
- Radical
- 5169
- 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
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 146
- 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
- no
- Odd
- yes
Appears in sequences
- Numbers k that divide the (right) concatenation of all numbers <= k written in base 11 (most significant digit on left).at n=39A029456
- Gaps of 7 in sequence A038593 (upper terms).at n=35A038654
- a(n) = (n+3)^3 - n^3.at n=39A038865
- Numbers k such that 3*2^k + 5 is prime.at n=50A057913
- Partial sums of A001158: Sum_{j=1..n} sigma_3(j).at n=14A064603
- Numbers k such that sigma(k^2 + 1) == 0 (mod k).at n=32A067719
- List of codewords in binary lexicode with Hamming distance 6 written as decimal numbers.at n=28A075934
- a(n) = 729*n - 531.at n=21A156771
- Numbers k such that k^2 + 1 == 0 (mod 41^2).at n=18A157116
- Values of n such that n^2 + (n-d)^2 is prime for a record first value of d.at n=18A239390
- Numbers k such that A334943(k) = 1.at n=14A335773
- The number of unlabeled trees T on n vertices for which maximum multiplicity attained by any matrix whose graph is T implies the simplicity of its other eigenvalues.at n=19A347018
- Numbers k such that sigma_2(k^2 + 1) == 0 (mod k).at n=32A360105