Properties of the Number 18808

Eighteen Thousand Eight Hundred Eight

Basics

Value: 18807 → 18808 → 18809

Parity: even

Prime: No

Previous Prime: 18803

Next Prime: 18839

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 2 ³ × 2351

Divisors: 1, 2, 4, 8, 2351, 4702, 9404, 18808

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 100100101111000

Octal: 44570

Duodecimal: AA74

Hexadecimal: 4978

Square: 353740864

Square Root: 137.14226190347014

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

T(n,k) = number of n X k binary arrays with rows and columns lexicographically nondecreasing and column sums nonincreasing. A266470

Number of ways to cover (without overlapping) a ring lattice (necklace) of n sites with molecules that are 5 sites wide. A58368

E.g.f.: exp( ∑_n>=1 ( ∏_k=1..n σ(k) ) * xⁿ/n! ). A294343

a(n) = 7·a(n-1) + 2·7ⁿ - 1, a(0) = 0. A392138

Least term in period of continued fraction for sqrt(n) is 7. A31431

Numbers k such that k! has a palindromic prime number of digits. A35067

Number of 6Xn binary arrays with rows and columns lexicographically nondecreasing and column sums nonincreasing. A266473

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 363", based on the 5-celled von Neumann neighborhood. A268154

Numbers k which are the product of a cube greater than 1 and a prime, and where k-1 and k-2 are semiprimes. A350284

Number of n X n binary arrays with rows and columns lexicographically nondecreasing and column sums nonincreasing. A266463