12218
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 14
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 18900
- Proper Divisor Sum (Aliquot Sum)
- 6682
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 5920
- Möbius Function
- -1
- Radical
- 12218
- Omega Function (Ω)
- 3
- 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
- 156
- 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
- Number of loopless rooted planar maps with 3 faces and n vertices and no isthmuses. Also a(n)=T(4,n-3), array T as in A049600.at n=38A006416
- Number of partitions of n into 8 unordered relatively prime parts.at n=42A023028
- Number of binary codes (not necessarily linear) of length n with 4 words.at n=15A034199
- Numbers whose base-4 representation contains exactly four 2's and three 3's.at n=18A045156
- Number of compositions into a prime number of distinct parts.at n=27A102623
- Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, -1), (0, 0, 1), (1, 0, 0), (1, 1, 0)}.at n=7A151065
- Upper s-Wythoff sequence, where s=A081276 (eighth cubes). Complement of A184431.at n=44A184432
- Number of partitions of n such that the number of parts and the smallest part are not coprime.at n=48A201025
- Number of (n+1)X(2+1) 0..3 arrays with the maximum plus the upper median plus the lower median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one.at n=1A237947
- T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the maximum plus the upper median plus the lower median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one.at n=4A237951
- Number of partitions p of n such that (maximal multiplicity of the parts of p) <= (maximal part of p).at n=35A240311
- Number of (n+2)X(5+2) 0..1 arrays with every 3X3 subblock sum of the two sums of the diagonal and antidiagonal minus the two minimums of the central column and central row nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=9A254904
- Numbers k such that Bernoulli number B_{k} has denominator 498.at n=18A282773
- A282133(n)/2.at n=34A286270
- Number of different coefficient values in expansion of Product_{k=1..n} (1+x^(k^2)).at n=42A369786
- Number of integer partitions of n whose maximal anti-runs have distinct maxima.at n=46A375133