12118
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 13
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 18648
- Proper Divisor Sum (Aliquot Sum)
- 6530
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 5904
- Möbius Function
- -1
- Radical
- 12118
- 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
- 143
- 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
- a(n+1) = a(n)-th composite and a(1) = 13.at n=32A059408
- Number of (3412,1234)-avoiding involutions in S_n.at n=27A085583
- Sum of largest parts (counted with multiplicity) of all partitions of n.at n=23A092321
- Row 5 of rectangular table A124460.at n=6A124465
- Numbers k such that the numerator of Sum_{j=1..k} k^2/(2*j*(j+k)) is prime.at n=46A125745
- Partial sums of A038034.at n=10A178097
- The number T(n) of isometries of all subspaces of the finite metric space {1,2,...,n} (as a subspace of the reals with the Euclidean metric).at n=11A183156
- Numbers n where abs(s(n)) produces a new minimum, with s(1) = 1 and s(i) = s(i-1) - sign(s(i-1))*(1/i).at n=51A203812
- Number of partitions p of n such that median(p) > multiplicity(max(p)).at n=36A240210
- Number of (n+2)X(5+2) 0..1 arrays with no 3x3 subblock diagonal sum 0 and no antidiagonal sum 0 and no row sum 2 and no column sum 2.at n=18A255225
- Length of n-th iterate of the mapping 00->0010, 01->001, 10->001, starting with 00.at n=16A289000
- Length of n-th iterate of the mapping 00->0010, 10->010, 1-->001, starting with 00.at n=16A289028
- Number of positive special sums of integer partitions of n.at n=23A301854
- Heinz number of the multiset of differences between consecutive divisors of n.at n=45A328023
- Number of distinct, irreducible ways that a Pythagorean hyperrectangle of 2 or more dimensions can produce diagonal length n.at n=49A375338