3156
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 15
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 7392
- Proper Divisor Sum (Aliquot Sum)
- 4236
- 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
- 1048
- Möbius Function
- 0
- Radical
- 1578
- Omega Function (Ω)
- 4
- 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
- no
- Narcissistic Number
- no
- Collatz Steps
- 30
- 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
- Number of connected graphs on n labeled nodes, each node being colored with one of 4 colors, such that no edge joins nodes of the same color.at n=4A002029
- Coordination sequence occurring in Zeolite Codes AFG, CAN, LIO, LOS.at n=39A008013
- Coordination sequence T5 for Zeolite Code HEU.at n=37A008120
- Coordination sequence T3 for Zeolite Code -CHI.at n=36A009848
- a(n) = a(n-1)+a(n-4).at n=24A014097
- Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite RTE = RUB-3 [Si24O48].2R starting with a T3 atom.at n=11A019223
- a(n) = n*(11*n - 1)/2.at n=24A022268
- Sums of distinct powers of 5.at n=39A033042
- Minimum sum of n distinct positive numbers, any n-1 of which sum to a square.at n=7A035305
- Positive numbers having the same set of digits in base 2 and base 5.at n=35A037410
- Sums of 4 distinct powers of 5.at n=5A038476
- Numbers having four 1's in base 5.at n=20A043356
- Numbers n such that string 5,6 occurs in the base 10 representation of n but not of n-1.at n=34A044388
- Numbers n such that string 5,6 occurs in the base 10 representation of n but not of n+1.at n=34A044769
- Partial sums of A045954.at n=38A045964
- Number of dissectable polyhedra with n tetrahedral cells and symmetry of type F.at n=24A047760
- a(n) = A047760(2n+1).at n=12A047761
- Number of dissectable polyhedra with n tetrahedral cells and symmetry of type D.at n=37A047773
- Becomes prime after exactly 6 iterations of f(x) = sum of prime factors of x.at n=27A047825
- Coordination sequence T5 for Zeolite Code SFE.at n=37A057321