12679
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 25
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 13120
- Proper Divisor Sum (Aliquot Sum)
- 441
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 12240
- Möbius Function
- 1
- Radical
- 12679
- 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
- 55
- 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
- no
- Odd
- yes
Appears in sequences
- Lucky numbers with size of gaps equal to 20 (lower terms).at n=26A031902
- Smallest number m with nonzero digits such that A046810(m)=n.at n=23A046813
- Semiprimes that are the sum of two positive cubes. Common terms of A003325 and A046315.at n=40A085366
- Numbers which are the sum of two positive cubes and divisible by 31.at n=21A102658
- Expansion of 1/(1 - x - x^3 + x^5).at n=45A123552
- Number of base 19 circular n-digit numbers with adjacent digits differing by 5 or less.at n=4A125382
- In those partitions of n with every part >=3, the total number of parts (counted with multiplicity).at n=41A177739
- Number of 0..2 arrays x(0..n-1) of n elements with each no smaller than the sum of its four previous neighbors modulo 3.at n=12A200463
- Sum of all aliquot divisors of all positive integers <= prime(n).at n=45A244578
- Values of a^3 + b^3 such that the equation a^3 + b^3 = x^2 + y^2 + z^2 is not soluble where a, b > 0 and x, y, z >= 0.at n=31A272174
- Semiprimes whose binary and ternary representations are prime when read in decimal.at n=17A279052
- Number of ordered triples (a,b,c) of positive integers less than n with the property that n divides a*b*c.at n=51A352078
- a(n) is the least positive integer that has exactly n anagrams that are semiprimes, or -1 if there is no such integer.at n=40A362499
- Expansion of g.f. Sum_{n>=1} q^n/(1-q^n-q^(3*n)).at n=26A368688
- Expansion of 1/( (1 + x)^2 * (1 - x*(1 + x)^2) ).at n=14A375371
- Consecutive states of the linear congruential pseudo-random number generator 237*s mod (2^16+1) when started at s=1.at n=18A385080