13879
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 28
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 13880
- Proper Divisor Sum (Aliquot Sum)
- 1
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 13878
- Möbius Function
- -1
- Radical
- 13879
- Omega Function (Ω)
- 1
- Little Omega Function (ω)
- 1
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
- 89
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- yes
- Composite Number
- no
- Semiprime
- no
- Squarefree Number
- yes
- Prime Power
- yes
- Prime Factorization
- no
- Twin Prime
- yes
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Prime Index
- 1640
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Quadruples of different integers from [ 2,n ] with no common factors between triples.at n=28A015629
- Number of days in n years (n=4 is the first leap year).at n=37A033171
- Number of days in n years (n=3 is the first leap year).at n=37A033172
- a(0)=2; a(n) is the smallest k > a(n-1) such that the fractional part of k^(1/11) starts with n.at n=38A034076
- Primes whose sum of digits is the perfect number 28.at n=33A048517
- Fifth term of strong prime quintets: p(m-3)-p(m-4) > p(m-2)-p(m-3) > p(m-1)-p(m-2) > p(m)-p(m-1).at n=32A054812
- Primes which are sandwiched between two numbers having the same unordered canonical form.at n=39A074460
- Numbers such that the sum of the factorials of the digits of the cube is a square.at n=38A126076
- Primes of the form 210k + 19.at n=37A140843
- Primes congruent to 21 mod 41.at n=34A142218
- Primes congruent to 33 mod 43.at n=40A142282
- Primes congruent to 14 mod 47.at n=37A142365
- Primes congruent to 12 mod 49.at n=35A142424
- Primes congruent to 46 mod 53.at n=28A142576
- Primes congruent to 19 mod 55.at n=39A142615
- Primes congruent to 14 mod 59.at n=29A142741
- Primes congruent to 32 mod 61.at n=25A142830
- Primes congruent to 34 mod 71.at n=23A154624
- Primes of the form Sum_{k=1..m} (m^k mod (m-k+1)).at n=37A156559
- Primes p such that 6p-7, 6p-5, 6p-1 are all prime.at n=31A157042