3180
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 12
- Digital Root
- 3
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 24
- Divisor Sum
- 9072
- Proper Divisor Sum (Aliquot Sum)
- 5892
- 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
- 832
- Möbius Function
- 0
- Radical
- 1590
- Omega Function (Ω)
- 5
- 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
- no
- Harshad Number
- yes
- Narcissistic Number
- no
- Collatz Steps
- 105
- 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
- Cluster series for site percolation problem on square matching lattice (square lattice with 1st and 2nd neighbors connected).at n=6A003201
- Number of paraffins.at n=22A005997
- Number of ternary squarefree words of length n.at n=21A006156
- From variance of Fibonacci search.at n=11A006479
- Coordination sequence T1 for Zeolite Code AET.at n=39A008007
- Coordination sequence T3 for Zeolite Code AFO.at n=37A008017
- Coordination sequence T2 for Zeolite Code MEI.at n=41A008147
- Coordination sequence T3 for Zeolite Code CGF.at n=39A019453
- Coordination sequence T4 for Zeolite Code CGF.at n=39A019454
- Coordination sequence T5 for Zeolite Code CGF.at n=39A019455
- a(n) = n*(11*n+1)/2.at n=24A022269
- Convolution of A000201 with itself.at n=18A023663
- [ (4th elementary symmetric function of S(n))/(2nd elementary symmetric function of S(n)) ], where S(n) = {first n+3 positive integers congruent to 2 mod 3}.at n=9A024402
- Duplicate of A022269.at n=23A026817
- a(n) = n*(n+7).at n=53A028563
- Theta series of 6-dimensional extremal 5-modular lattice Q6(4)^{+2}.at n=46A029721
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 28.at n=30A031526
- "DHK" (bracelet, identity, unlabeled) transform of 0,1,1,1,...at n=25A032244
- Numbers k such that A174141(k) is divisible by k.at n=28A032581
- Write cosec x = 1/x + Sum e_n x^(2n-1)/(2n-1)!; sequence gives denominators of e_n.at n=25A036283