13909
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 22
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 15904
- Proper Divisor Sum (Aliquot Sum)
- 1995
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 11916
- Möbius Function
- 1
- Radical
- 13909
- Omega Function (Ω)
- 2
- 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
- 32
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- yes
- 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
- Permanent of a certain cyclic n X n (0,1) matrix.at n=11A000804
- Class numbers associated with terms of A001986.at n=26A001987
- Class numbers associated with terms of A001986.at n=27A001987
- Class numbers associated with terms of A001986.at n=28A001987
- a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = (composite numbers), t = (primes).at n=27A024604
- Class numbers associated with entries of A094841.at n=27A094842
- Class numbers associated with entries of A094841.at n=28A094842
- Class numbers associated with the entries of A094843.at n=14A094844
- Records in A001987.at n=10A094846
- Number of permutations p of [n] such that (n-p(i)+i) mod n >= 6 for all i.at n=11A184965
- Number of (n+2)X(7+2) 0..1 arrays with every 3X3 subblock sum of the two sums of the diagonal and antidiagonal minus the two minimums of the central column and central row nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=27A254906
- Numbers n such that the sum of the distinct prime factors of prime(n)-1 and prime(n+1)-1 are the same.at n=10A259562
- Number of partitions of n such that the (sum of distinct even parts) = floor(n/2).at n=52A284610
- Maximal coefficient of (1 + x) * (1 + x^8) * (1 + x^27) * ... * (1 + x^(n^3)).at n=29A359319
- Convolution of A000041 and A000290.at n=16A360486