12857
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 23
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 14784
- Proper Divisor Sum (Aliquot Sum)
- 1927
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 11088
- Möbius Function
- -1
- Radical
- 12857
- Omega Function (Ω)
- 3
- Little Omega Function (ω)
- 3
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
- yes
- Narcissistic Number
- no
- Collatz Steps
- 169
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- 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
- Base-7 palindromes that start with 5.at n=33A043019
- Bends in loxodromic sequence of spheres in which each 5 consecutive spheres are in mutual contact.at n=16A045626
- Number of periodic palindromic structures of length n using exactly six different symbols.at n=17A056512
- Number of primitive (period n) periodic palindromic structures using exactly six different symbols.at n=17A056523
- Numbers k such that 4*phi(k) = 3*sigma(k).at n=4A065819
- a(n) is the first of a triple of consecutive integers, each of which is the product of three distinct primes.at n=27A066509
- a(n) = smallest k such that the digit sum of 7k is n.at n=42A077494
- a(n) = n-th multiple of n with digit sum n.at n=22A082260
- Starting positions of strings of three 2's in the decimal expansion of Pi.at n=17A083606
- Smallest k > 0 such that abs(S(k)P(k)-k) equals n, where S(k) is the sum and P(k) is the product of decimal digits of k or 0 if no such k exists.at n=23A114457
- a(n) = n*(7*n-2).at n=43A135703
- Number of 2 X 2 matrices with all elements in {0,1,...,n} and determinant in {0,1}.at n=37A209991
- Numbers k whose decimal expansion can be split into at least two parts whose binary equivalents can be concatenated (in the same order) to form the binary expansion of the original number k.at n=37A237041
- Number of compositions of n in which the maximal multiplicity of parts equals 9.at n=10A243126
- Number of unlabeled rooted trees with n nodes in which all positive outdegrees are different.at n=21A298478
- First occurrence of n in A334144.at n=41A333959
- a(n) = (1/8)*A357285.at n=17A357286