8660
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 20
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 18228
- Proper Divisor Sum (Aliquot Sum)
- 9568
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 3456
- Möbius Function
- 0
- Radical
- 4330
- Omega Function (Ω)
- 4
- 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
- 47
- 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
- yes
- Odd
- no
Appears in sequences
- a(n) = n*a(n-1) + 1, a(0) = 0.at n=7A002627
- Number of unlabeled series-parallel posets (i.e., generated by unions and sums) with n nodes.at n=9A003430
- Composite n such that phi(n) * sigma(n) is one less than a square.at n=35A015709
- Composite and even n such that phi(n) * sigma(n) is one less than a square.at n=21A015721
- Numbers n such that 123*2^n-1 is prime.at n=27A050587
- Each term in the table is the product of the two terms above it + 1.at n=38A059922
- Each term in the table is the product of the two terms above it + 1.at n=42A059922
- Numbers k > 1 such that, in base 4, k and k^2 contain the same digits in the same proportion.at n=28A061658
- a(n) = 6*binomial(n,4) + 5*binomial(n,2) - 4*n + 5.at n=14A066455
- Upper bound on number of regular triangulations of cyclic polytope C(n, n-4).at n=28A066456
- Number of (-1,0,1) polynomials of degree-n irreducible over the integers.at n=8A087610
- Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 1, -1), (-1, 1, 1), (1, -1, 0), (1, 1, 0)}.at n=8A149164
- Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 1, -1), (-1, 1, 1), (1, 0, 1), (1, 1, 0)}.at n=7A150707
- Numbers n with property that n^2 is a sum of some 120 successive primes.at n=2A166262
- a(n) = (11*n^2 - 7*n)/2.at n=40A180223
- Upper s-Wythoff sequence, where s=A081276 (eighth cubes). Complement of A184431.at n=39A184432
- Nonnegative values x of solutions (x, y) to the Diophantine equation x^2 + (x+433)^2 = y^2.at n=6A207061
- Principal diagonal of the convolution array A213778.at n=28A213779
- Numbers k such that 3^k + 20 is prime.at n=30A219040
- Minimum even value unattainable as the sum of 6 attained values of i*(i-1) with i in 0..n.at n=40A225292