12718
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 19080
- Proper Divisor Sum (Aliquot Sum)
- 6362
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 6358
- Möbius Function
- 1
- Radical
- 12718
- Omega Function (Ω)
- 2
- 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
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 81
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- yes
- 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(0) = 1, a(n) = 11*n^2 + 2 for n>0.at n=34A010003
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 56 ones.at n=33A031824
- Number of partitions of n in which each part occurs an odd number (or zero) times.at n=44A055922
- Numbers k such that 5*3^k + 2 is prime.at n=33A058590
- Sum of the first 2n+1 primes.at n=37A109723
- Numbers k such that binomial(5k, k) + 1 is prime.at n=12A125243
- Semiprimes in A007504 (the sum of first n primes).at n=22A189072
- Number of right triangles on an (n+1) X 3 grid.at n=43A189807
- Number of (w,x,y,z) with all terms in {1,...,n} and w+y=|x-y|+|y-z|.at n=29A212677
- Expansion of Product_{k>=1} 1/(1-x^k)^(k*(k+1)).at n=9A258347
- Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 299", based on the 5-celled von Neumann neighborhood.at n=26A271154
- Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 510", based on the 5-celled von Neumann neighborhood.at n=33A272700
- Prime summand recurrence: a(n+1) = the sum of the primes <= a(n) with a(0) = 3.at n=6A283462
- Number of irredundant sets in the complete tripartite graph K_{n,n,n}.at n=11A290709
- The sum S of the maximum number of consecutive primes starting with 2 such that S <= prime(n)^2.at n=29A346134
- Polygonal numbers of order greater than 2 (A090466) which are the sum of the first k primes, for some k > 0.at n=45A364694