8518
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 22
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 12780
- Proper Divisor Sum (Aliquot Sum)
- 4262
- 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
- 4258
- Möbius Function
- 1
- Radical
- 8518
- Omega Function (Ω)
- 2
- 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
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 127
- Smith Number
- yes
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- yes
- 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
- Expansion of 1/((1+x)*(1-x)^9).at n=8A001780
- Eleven iterations of Reverse and Add are needed to reach a palindrome.at n=24A015992
- Number of nodes of even outdegree (including leaves) in all ordered trees with n edges.at n=8A026641
- a(n) = A026637(n, floor(n/2)).at n=15A026643
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 92.at n=5A031590
- Numbers k such that A102489(k) is divisible by k.at n=33A032563
- Numbers n such that 183*2^n-1 is prime.at n=17A050843
- Numbers k such that 2*3^k + 5 is prime.at n=24A057911
- Numbers k such that 2*7^k + 3 is prime.at n=17A059075
- Numbers which need eleven 'Reverse and Add' steps to reach a palindrome.at n=22A065216
- Number of symmetric Dyck paths of semilength n and having no hills (i.e., no peaks at level 1).at n=16A109078
- A tree-node counting triangle.at n=36A109244
- A number triangle of sums of binomial products.at n=69A110541
- Lesser of twin simili-primes of order 2.at n=33A126699
- Number of increasing initial sequences of bases of order 3.at n=6A152112
- Triangle T(n,k) read by rows, matrix product of A046899(row-reversed) * A130595.at n=36A158815
- Positions of zeros in A165582.at n=34A165583
- Number of admissible basis in the postage stamp problem for n denominations and h = 3 stamps.at n=5A167810
- Triangle T, read by rows : T(n,k) = A007318(n,k)*A026641(n-k).at n=36A171650
- Coefficient array for square of Chebyshev S-polynomials.at n=76A181878