Properties of the Number 18680

Eighteen Thousand Six Hundred Eighty

Basics

Value: 18679 → 18680 → 18681

Parity: even

Prime: No

Previous Prime: 18679

Next Prime: 18691

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 2 ³ × 5 × 467

Divisors: 1, 2, 4, 5, 8, 10, 20, 40, 467, 934

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100100011111000

Octal: 44370

Duodecimal: A988

Hexadecimal: 48f8

Square: 348942400

Square Root: 136.6747965061591

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

Poincaré series for hyperbolic reflection group with Coxeter diagram o---o-(5)-o---o. A265044

Array read by antidiagonals: T(n,k) = number of noncrossing path sets on k·n nodes up to rotation with each path having exactly k nodes. A303864

Number of permutations p of [n] such that p(p(i)) = i for all i or p(n+1-p(i)) = n+1-i for all i. A297708

G.f.: ∏_n=-oo..+oo (1 + xⁿ*(1 + xⁿ)ⁿ). A293603

Starting positions of strings of three 9's in the decimal expansion of π. A83642

Row sums of triangle defined in A113820. A160968

Expansion of a modular function. A6707

Length of n-th term of A022482. A22483

Numbers k such that 3·10^k + 13 is prime. A290473

Number of ways to write n=p+q+(n mod 2)q with p>q and p, q, 6q-1, 6q+1 all prime. A220091