15608
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
- 1
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 29280
- Proper Divisor Sum (Aliquot Sum)
- 13672
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 7800
- Möbius Function
- 0
- Radical
- 3902
- Omega Function (Ω)
- 4
- 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
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 177
- 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 weighted voting procedures.at n=14A005257
- Number of 5-tuples of different integers from [ 2,n ] with no common factors among pairs.at n=36A015699
- XOR-convolution of squares A000290 with themselves.at n=28A033460
- Gaps of 9 in sequence A038593 (lower terms).at n=10A038657
- Gaps of 10 in sequence A038593 (upper terms).at n=11A038660
- Numbers k such that phi(k) = sigma(k+1) - sigma(k-1).at n=16A066155
- Numbers n such that sigma(n+1) = n + phi(n).at n=10A068402
- Where 3^n occurs in n-almost primes, starting at a(0)=1.at n=20A078843
- Triangular array related to tennis ball problem, read by rows.at n=48A079521
- a(1) = 2, a(n) = (n-th-even n^3) - (sum of previous terms).at n=26A181509
- Number of days after Mar 01 00 such that the date written in the format DD.MM.YY is palindromic.at n=14A210887
- Number of (w,x,y,z) with all terms in {1,...,n} and |w-x|<|x-y|+|y-z|.at n=12A212571
- Number of 4 X n 0..1 arrays with rows nondecreasing and antidiagonals unimodal.at n=12A224135
- Number of nondecreasing -n..n vectors of length 3 whose dot product with some nonincreasing -n..n vector equals 3.at n=22A226400
- Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 123", based on the 5-celled von Neumann neighborhood.at n=28A270212
- Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 193", based on the 5-celled von Neumann neighborhood.at n=25A279722
- Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 449", based on the 5-celled von Neumann neighborhood.at n=25A282267
- Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 451", based on the 5-celled von Neumann neighborhood.at n=25A282298
- Triangle T(n, k) for the number of permutations of symmetric group S_n with an odd number of non-fixed point cycles, without k <= n particular fixed points.at n=38A374420
- Numbers k such that k and k+1 have an equal sum of modified exponential divisors: A241405(k) = A241405(k+1).at n=21A379032