15408
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
- 30
- Divisor Sum
- 43524
- Proper Divisor Sum (Aliquot Sum)
- 28116
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 5088
- Möbius Function
- 0
- Radical
- 642
- Omega Function (Ω)
- 7
- 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
- 53
- 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
- Even octagonal numbers: a(n) = 4*n*(3*n-1).at n=36A014642
- Numbers whose base-4 representation contains exactly four 0's and three 3's.at n=12A045084
- Open 3-dimensional ball numbers (version 4): a(n) is the number of integer points (i,j,k) contained in an open ball of diameter n, centered at (1/2, 1/2, 1/2).at n=31A053596
- a(n) is the (n+1)st (n+2)-gonal number.at n=31A064808
- 33-gonal numbers: n(31n-29)/2.at n=32A098923
- Octagonal numbers for which the product of the digits is also an octagonal number.at n=31A117083
- Number of spiro bicyclic skeletons with n carbon atoms (see Parks et al. for precise definition).at n=8A121159
- Octagonal numbers which are the sums of exactly two positive octagonal numbers.at n=12A136346
- Ulam's spiral (WNW spoke).at n=31A143859
- Denominator of convergents to e - 1/e.at n=9A197223
- Number of nX1 0..3 arrays with exactly floor(nX1/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order.at n=14A222269
- Sum of the asymmetry degrees of all compositions of n with parts in {1,5}.at n=33A276065
- p-INVERT of (1,0,0,0,1,0,0,0,0,0,...), where p(S) = (1 - S)^2.at n=26A292325
- List of free corner-connected polyominoes in binary code (as defined in A246521), ordered first by number of bits, then by value of the binary code.at n=33A364928
- Number of partitions of n with six designated summands.at n=14A384926