13939
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
- 4
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 14256
- Proper Divisor Sum (Aliquot Sum)
- 317
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 13624
- Möbius Function
- 1
- Radical
- 13939
- 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
- 58
- 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
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 51 ones.at n=0A031819
- Numbers k whose decimal representation, read as a base-18 value and divided by k, yields an integer.at n=24A032567
- Partial sums of A028388 good primes (version 2).at n=40A172166
- Positive integers of the form (7*m^2+1)/11.at n=26A179370
- Numbers k such that there are 15 primes between 100*k and 100*k + 99.at n=20A186407
- The number of permutations of length n sortable by 3 prefix block transpositions.at n=8A228395
- Numbers n such that 2*n + prime(n) is a square.at n=34A256246
- Semiprime numbers whose digit string can be partitioned into three parts such that the product of the first two parts equals the third part.at n=27A280636
- Expansion of Product_{k>=1} (1 + x^k) / (1 - x^(3*k)).at n=42A285445
- Numbers k such that k!4 + 2^3 is prime, where k!4 = k!!!! is the quadruple factorial number (A007662).at n=37A291343
- Numbers that cannot be written as a difference of 11-smooth numbers.at n=15A326319