16399
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 28
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 17696
- Proper Divisor Sum (Aliquot Sum)
- 1297
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 15180
- Möbius Function
- 0
- Radical
- 713
- 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
- 115
- 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
- no
- Odd
- yes
Appears in sequences
- a(n) = 2^n + n + 1.at n=14A005126
- a(n) = (2*n - 15)*n^2.at n=23A015247
- Composite numbers k such that the sum of the proper divisors of k not including 1, (Chowla's function, A048050) and their product (A007956) are both perfect squares.at n=38A064180
- a(n) = (n^3 + 24*n^2 + 65*n + 36)/6.at n=39A087863
- a(n) = ceiling( 1/2 + (Sum_{i=0..n-1}C(n,i)*C(n,i+1))/2^(n+1) ).at n=16A099779
- a(1)=1. a(2n+1) = sum{k=1 to 2n} a(k). a(2n) = the smallest positive integer not yet occurring in the sequence.at n=24A140598
- Members of A038512 of the form k, k+2, k+6, k+8.at n=23A155511
- Partial sums of A162766.at n=14A164265
- a(n) = smallest number that leads to a new fixed point under the base-2 Kaprekar map of A164884.at n=40A164887
- a(n) = smallest number that leads to a new cycle under the base-4 Kaprekar map of A165012.at n=11A165029
- Multiples of 23 whose digit reversal - 1 is also a multiple of 23.at n=28A166400
- a(n,k) equals (1/n!) multiplied by the count of permutations with cycle length k in all products u v u^-1 v^-1 over all permutations u and v of length n.at n=75A191716
- Number of nX3 0..2 arrays with rows and columns lexicographically nondecreasing and the instance counts of every value within one of each other.at n=5A201427
- Number of nX6 0..2 arrays with rows and columns lexicographically nondecreasing and the instance counts of every value within one of each other.at n=2A201430
- T(n,k)=Number of nXk 0..2 arrays with rows and columns lexicographically nondecreasing and the instance counts of every value within one of each other.at n=30A201432
- T(n,k)=Number of nXk 0..2 arrays with rows and columns lexicographically nondecreasing and the instance counts of every value within one of each other.at n=33A201432
- Number of unlabeled graphs on n nodes whose components are cycles or complete graphs.at n=27A217067
- Maximal non-semiprime number which is a "preprime" of the n-th kind (defined in comment in A247395).at n=22A247834
- Numerator of (0 followed by A005126(n)= 2, 4, 7, ...)/2^n.at n=15A271573
- Positions of 0 in A288132; complement of A288134.at n=15A288133