8666
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 26
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 14880
- Proper Divisor Sum (Aliquot Sum)
- 6214
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 3708
- Möbius Function
- -1
- Radical
- 8666
- 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
- no
- Narcissistic Number
- no
- Collatz Steps
- 140
- 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
- yes
- Odd
- no
Appears in sequences
- a(n) = 6*n^2 + 2 for n > 0, a(0)=1.at n=38A005897
- a(0) = 1, a(n) = 24*n^2 + 2 for n>0.at n=19A010014
- Numbers k such that the decimal part of k^(1/9) starts with a 'nine digits' anagram.at n=3A034284
- Sum of distances between dual pairs of partitions of n for the canonical order.at n=13A036045
- Numbers ending with '6' that are the difference of two positive cubes.at n=32A038861
- Number of partitions satisfying cn(1,5) < cn(2,5) + cn(3,5) and cn(4,5) < cn(2,5) + cn(3,5).at n=36A039888
- Denominators of continued fraction convergents to sqrt(813).at n=8A042569
- Numbers having three 6's in base 10.at n=34A043515
- a(0) = 1; a(n) = Sum_{0 <= k < n and gcd(k,n) = 1} a(k).at n=18A045545
- Beastly (or hateful) numbers: numbers containing the string 666 in their decimal expansion.at n=17A051003
- a(n) = Sum_{ r = 0 to n} L(n,r), where L(n,r) (A067049) = lcm(n, n-1, n-2, ..., n-r+1)/lcm(1, 2, 3, ..., r).at n=16A061297
- Number of 5-ary Lyndon words of length n over Z_5 with trace 0 and subtrace 1.at n=8A074415
- Number of 5-ary Lyndon words of length n over Z_5 with trace 0 and subtrace 2.at n=8A074416
- Number of 5-ary Lyndon words of length n over Z_5 with trace 1 and subtrace 0.at n=8A074417
- Number of 5-ary Lyndon words of length n over Z_5 with trace 1 and subtrace 2.at n=8A074419
- Number of 5-ary Lyndon words of length n over Z_5 with trace 1 and subtrace 3.at n=8A074420
- Number of 5-ary Lyndon words of length n over Z_5 with trace 1 and subtrace 4.at n=8A074421
- Interprimes which are of the form s*prime, s=14.at n=14A075289
- Number of permutations satisfying -k<=p(i)-i<=r and p(i)-i not in I, i=1..n, with k=1, r=5, I={0,3}.at n=26A079965
- Triangle T(n,m) read by rows: matrix product A053121 * A038207.at n=46A096164