15755
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 23
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 19872
- Proper Divisor Sum (Aliquot Sum)
- 4117
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 11968
- Möbius Function
- -1
- Radical
- 15755
- 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
- yes
- Narcissistic Number
- no
- Collatz Steps
- 128
- 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
- no
- Odd
- yes
Appears in sequences
- Numbers of Twopins positions.at n=23A005688
- q-Fibonacci numbers for q=5, scaling a(n-1).at n=4A015476
- Sums of 3 distinct powers of 5.at n=24A038475
- Denominators of continued fraction convergents to sqrt(887).at n=11A042715
- Number of times n appears among the decimal digits of (n!)!.at n=7A078670
- Numbers k such that 10*(11*10^k - 1) + 1 is prime.at n=9A123372
- Number of Garden of Eden partitions of n in Bulgarian Solitaire.at n=39A123975
- a(n) = 12167*n - 8579.at n=1A156845
- 5 times centered pentagonal numbers: 5*(5*n^2 + 5*n + 2)/2.at n=35A164015
- Multiples of 23 whose digit reversal + 1 is also a multiple of 23.at n=26A166393
- Number of arrays of 4 nondecreasing integers in -n..n with sum zero and equal numbers greater than zero and less than zero.at n=44A203292
- Number of (w,x,y) with all terms in {0,...,n} and w>=range{w,x,y}.at n=29A212968
- Smallest m such that gcd(A227113(m+1), A227113(m)) = n.at n=31A227289
- Partial sums of A252750: a(0) = 0; for >= 1: a(n) = A252750(n) + a(n-1).at n=63A252751
- Numbers with all digits odd whose squares have only one odd digit.at n=34A343727