13851
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 14
- Divisor Sum
- 21860
- Proper Divisor Sum (Aliquot Sum)
- 8009
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 8748
- Möbius Function
- 0
- Radical
- 57
- Omega Function (Ω)
- 7
- 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
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 76
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- 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 n such that n divides 2^n + 1.at n=16A006521
- Numbers k that divide s(k), where s(1)=1, s(j)=19*s(j-1)+j.at n=23A014869
- Numbers k such that k divides s(k), where s(1)=1, s(j)= s(j-1) + j*7^(j-1).at n=26A014948
- Numbers k such that k | 8^k + 1.at n=19A015955
- Pseudo-powers to base 3: numbers k that are not powers of 3 such that k divides 2^k + 1.at n=7A016057
- Numbers k such that k^2 is palindromic in base 8.at n=42A029805
- Numbers having four 3's in base 8.at n=6A043436
- Numbers k that divide 4^k + 2^k or 8^k + 4^k.at n=41A045577
- Numbers k that divide 7^k + 2^k.at n=32A045580
- Odd numbers divisible by exactly 7 primes (counted with multiplicity).at n=11A046320
- Numbers that are the sum of two (possibly negative) cubes in at least 2 ways.at n=41A051347
- Numbers n such that n | 12^n + 11^n + 10^n + 9^n + 8^n + 7^n.at n=32A057257
- Numbers k such that the squarefree part of k equals A062799(k).at n=26A069551
- Number of non-anti-commutative closed binary operations on a set of order n.at n=3A079186
- Numbers n such that n divides 2^n^2 + 1.at n=20A093546
- Numbers k that divide 2^(k^3) + 1.at n=21A093665
- Numbers which are the sum of two positive cubes and divisible by 19.at n=33A102619
- Legendre-binomial transform of 2^n for p=3.at n=14A117976
- Legendre-binomial transform of 2^n for p=3.at n=13A117976
- Numbers n such that sigma(lambda(n)) = lambda(sigma(n)).at n=32A173942