17446
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 22
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 16
- Divisor Sum
- 31248
- Proper Divisor Sum (Aliquot Sum)
- 13802
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 7200
- Möbius Function
- 1
- Radical
- 17446
- Omega Function (Ω)
- 4
- 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
- 141
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- yes
- 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
- Impedances of an n-terminal network.at n=4A003130
- Distinct even elements in 4-Pascal triangle A028275 (by row).at n=34A028282
- Elements to right of central elements in 4-Pascal triangle A028275 that are not 1.at n=49A028285
- Even elements to right of central elements in 4-Pascal triangle A028275.at n=24A028286
- Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 12.at n=22A031690
- Numbers n such that sum of cubes of even digits of n equals sum of cubes of odd digits of n.at n=9A076165
- a(n) = Sum_{k = 0..n} binomial(n,k)*trinomial(n,k), where trinomial(n,k) = trinomial coefficients.at n=7A082759
- Even pseudoprimes to base 9.at n=23A090083
- a(n) = A000045(n) - A000931(n).at n=22A129973
- a(n) = 36*n^2 + n.at n=21A157324
- 144n^2 + 2n.at n=10A158132
- a(n) = 484*n^2 + 22.at n=6A158629
- Antidiagonal sums of the convolution array A213561.at n=9A213563
- Numbers n such that 7^n - 8 is prime.at n=15A217131
- Number of partitions of n such that (number of distinct parts) = number of 2's.at n=54A239961
- Number of compositions of n such that every distinct consecutive subsequence has a different sum.at n=32A325676
- Numbers that are the sum of an emirp and its reversal in more than one way.at n=25A345408
- a(n) = (2n^2 - n + 2) * (2n)! / ((n + 1) * (n + 2) * n!^2).at n=7A349695
- Numbers k such that the k-th composition in standard order is a non-alternating permutation of an initial interval of positive integers.at n=36A350250
- a(n) = floor((2*n)!/(n!^2*a(n-1))), with a(0)=1.at n=15A372989