1636
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 16
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 2870
- Proper Divisor Sum (Aliquot Sum)
- 1234
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 816
- Möbius Function
- 0
- Radical
- 818
- Omega Function (Ω)
- 3
- 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
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 42
- 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
- a(0)=1, a(n) = 3*a(n-1) + n + 1.at n=6A000340
- Number of nonnegative solutions to x^2 + y^2 <= n^2.at n=45A000603
- Number of partitions of 3n into n parts from the set {0, 1, ..., 6} (repetitions admissible).at n=15A001977
- Truncated square numbers: 7*n^2 + 4*n + 1.at n=15A005892
- Number of P-graphs with 2n edges.at n=10A007165
- McKay-Thompson series of class 4C for the Monster group.at n=5A007248
- Coordination sequence T1 for Zeolite Code ATT.at n=29A008041
- Coordination sequence T2 for Zeolite Code ATT.at n=29A008042
- Coordination sequence T1 for Zeolite Code CHA.at n=31A008066
- Coordination sequence T1 for Zeolite Code LOS.at n=28A008132
- Coordination sequence T2 for Zeolite Code TON.at n=25A008242
- Triangle read by rows: T(n,k) is the number of permutations of [n] with k increasing runs of length at least 2.at n=21A008971
- Coordination sequence T1 for Zeolite Code DFO.at n=31A009875
- Coordination sequence T6 for Zeolite Code VNI.at n=25A009912
- a(n) = floor(n*(n-1)*(n-2)/24).at n=35A011842
- a(n) = floor( n*(n-1)*(n-2)/20 ).at n=33A011902
- Pseudoprimes to base 53.at n=24A020181
- Numbers k such that the continued fraction for sqrt(k) has period 42.at n=10A020381
- Numbers k such that Fibonacci(k) == 3 (mod k).at n=21A023175
- Numbers n such that n divides the (right) concatenation of all numbers <= n written in base 14 (most significant digit on right).at n=13A029507