1352
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 11
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 2745
- Proper Divisor Sum (Aliquot Sum)
- 1393
- 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
- 624
- Möbius Function
- 0
- Radical
- 26
- Omega Function (Ω)
- 5
- 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
- 52
- 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
- yes
- Achilles Number
- yes
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- yes
- Odd
- no
Appears in sequences
- a(n) = ceiling(n^2/2).at n=52A000982
- a(n) = 2*n^2.at n=26A001105
- Number of regular semigroups of order n, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator).at n=5A001427
- a(n) = floor(n*phi^10), where phi is the golden ratio, A001622.at n=11A004925
- a(n) = 6*n^2 + 2 for n > 0, a(0)=1.at n=15A005897
- Hexagonal prism numbers: a(n) = (n + 1)*(3*n^2 + 3*n + 1).at n=7A005915
- Restricted combinations.at n=14A006500
- Number of order-consecutive partitions of n.at n=6A007052
- a(n) = a(n-1) + (3+(-1)^n)*a(n-2)/2.at n=11A007068
- a(n) = floor(n^2/2).at n=52A007590
- Number of unordered sets of pairs (in-degree, out-degree) for nodes of directed trees on n unlabeled nodes (the edges are directed in arbitrary directions, the tree is unrooted).at n=9A007835
- Coordination sequence T1 for Zeolite Code AFS.at n=28A008023
- Coordination sequence T3 for Zeolite Code GOO.at n=25A008113
- Coordination sequence T5 for Zeolite Code MFS.at n=23A008177
- Coordination sequence T3 for Zeolite Code MTW.at n=24A008198
- Expansion of g.f.: x^4/((1-x)*(1-x^2)^2*(1-x^3)).at n=46A008763
- Expansion of (1+x^4)/((1-x)*(1-x^2)*(1-x^3)*(1-x^4)).at n=43A008765
- Coordination sequence for NiAs(1), As position.at n=15A009943
- f-vectors for simplicial complexes of dimension at most 1 (graphs) on at most n-1 vertices.at n=20A011826
- a(n) = floor( n*(n-1)*(n-2)/22 ).at n=32A011904