12843
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 18564
- Proper Divisor Sum (Aliquot Sum)
- 5721
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 8556
- Möbius Function
- 0
- Radical
- 4281
- 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
- 63
- 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
- Number of loopless rooted planar maps with 5 faces and n vertices and no isthmuses.at n=4A006418
- Vampire numbers: (definition 1): n has a nontrivial factorization using n's digits.at n=36A020342
- Sum of composite numbers less than n-th prime.at n=40A079725
- a(1)=1, a(n)=2a(n-1)+1 if a(n-1) is prime, a(n)=a(n-1)+1 otherwise.at n=45A083005
- Number of partitions of n such that the set of parts has an even number of elements.at n=38A092306
- a(n) = 338*n - 1.at n=37A157999
- a(n) = 676*n - 1.at n=18A158393
- a(n) = 76*n^2 - 1.at n=12A158765
- Constant term of the reduction by x^2->x+1 of the polynomial p(n,x) defined at Comments.at n=9A193046
- Numbers k whose decimal expansion can be split into at least two parts whose binary equivalents can be concatenated (in the same order) to form the binary expansion of the original number k.at n=23A237041
- Expansion of Product_{k>=1} (1 + k*x^(k^2))^k.at n=50A285242
- Expansion of 1/(1 + x/(1 + x^3/(1 + x^4/(1 + x^7/(1 + x^11/(1 + ... + x^Lucas(k)/(1 + ...))))))), a continued fraction.at n=30A294922
- Number of nX3 0..1 arrays with every element equal to 0, 2, 3, 5 or 8 king-move adjacent elements, with upper left element zero.at n=11A298722
- Table of distinct triples (A,B,C) such that A = B * C with B < C and A's digits being distinct and split between B and C.at n=51A331401
- Partial sums of A334136.at n=28A332264
- Triangle read by rows: T(n,k) is the number of rooted loopless planar maps with n edges, k faces and no isthmuses, n >= 0, k = 1..n+1.at n=49A342980
- Triangle read by rows: T(n,k) is the number of rooted loopless planar maps with n edges, k faces and no isthmuses, n >= 0, k = 1..n+1.at n=50A342980
- Number of partitions p of n such that (1/4)*max(p) is a part of p.at n=45A363067