2646
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 24
- Divisor Sum
- 6840
- Proper Divisor Sum (Aliquot Sum)
- 4194
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 756
- Möbius Function
- 0
- Radical
- 42
- Omega Function (Ω)
- 6
- 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
- Stirling numbers of the second kind, S(n,6).at n=3A000770
- Related to S(n), the number of self-dual monotone Boolean functions of n variables (A001206): 2^n-th term is S(n).at n=31A001087
- Number of self-dual monotone Boolean functions of n variables.at n=6A001206
- Stirling numbers of the second kind S(n+3, n).at n=6A001297
- Generalized Fibonacci numbers A_{n,2}.at n=26A006207
- Coordination sequence T2 for Zeolite Code EPI.at n=32A008091
- Coordination sequence T10 for Zeolite Code EUO.at n=32A008096
- Coordination sequence T6 for Zeolite Code MEL.at n=33A008155
- Coordination sequence T2 for Cordierite.at n=31A008252
- Triangle of Stirling numbers of the second kind, S2(n,k), n >= 1, 1 <= k <= n.at n=41A008277
- Reflected triangle of Stirling numbers of 2nd kind, S(n,n-k+1), n >= 1, 1 <= k <= n.at n=39A008278
- Molien series for A_5.at n=41A008628
- Coordination sequence for MgNi2, Position Ni2.at n=13A009932
- Triangle of coefficients in expansion of (3+7x)^n.at n=12A013624
- Numbers k such that k divides 2^(k+1) - 2.at n=20A014741
- Number of ordered quadruples of integers from [ 2,n ] with no global factor.at n=14A015638
- Positive integers n such that n | (2^n + n/2 - 1).at n=18A015942
- Number of 5-voter voting schemes with n linearly ranked choices.at n=2A018223
- a(n) = n^2*(n-1)^3/4.at n=7A019584
- a(n) is the least k > 0 such that k and 3k are anagrams in base n (written in base 10).at n=24A023095