11880
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
- 64
- Divisor Sum
- 43200
- Proper Divisor Sum (Aliquot Sum)
- 31320
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 2880
- Möbius Function
- 0
- Radical
- 330
- Omega Function (Ω)
- 8
- Little Omega Function (ω)
- 4
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
- yes
- Harshad Number
- yes
- Narcissistic Number
- no
- Collatz Steps
- 50
- 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+3, n).at n=8A001297
- Triangle of Stirling numbers of the second kind, S2(n,k), n >= 1, 1 <= k <= n.at n=62A008277
- Area of more than one Pythagorean triangle.at n=13A009127
- Stirling numbers of second kind S2(11,n).at n=7A011560
- One sixth of 9-factorial numbers.at n=3A035020
- Triangle read by rows, the Bell transform of the triple factorial numbers A007559(n+1) without column 0.at n=17A035469
- a(n) = (n+8)!/8!.at n=4A049389
- Stirling numbers of second kind: 8th column of Stirling2 triangle A008277.at n=3A049434
- Generalized Stirling number triangle of first kind.at n=10A051380
- Products of 4 consecutive integers: a(n) = n*(n-1)*(n-2)*(n-3).at n=12A052762
- a(n) = n*(n-1)*(n-2)*(n-3) for n>=5.at n=12A052768
- a(n) = 4*n*(4*n-1)*(4*n-2)*(4*n-3).at n=3A054777
- Number of primitive (period n) periodic palindromes using exactly three different symbols.at n=15A056499
- Number of conjugacy classes in the group GL_2(K) when K is a finite field with q = p^m for a prime p and m >= 1.at n=38A060615
- Triangle read by rows, T(n, k) = binomial(n, k)*binomial(n + 2, k).at n=52A062196
- Numbers k such that sigma(k) - usigma(k) > 2k.at n=28A063846
- a(n) = (3*n)!/(2*n)!.at n=4A064352
- Numbers k such that phi(4k-1) = sigma(k).at n=5A067235
- Numbers k such that sigma(k) = phi(k*omega(k)-1).at n=43A067878
- Engel expansion of sinh(1/2).at n=27A068379