Properties of the Number 18668

Eighteen Thousand Six Hundred Sixty-Eight

Basics

Value: 18667 → 18668 → 18669

Parity: even

Prime: No

Previous Prime: 18661

Next Prime: 18671

Digit Sum: 29

Digital Root: 2

Palindrome: No

Factorization: 2 ² × 13 × 359

Divisors: 1, 2, 4, 13, 26, 52, 359, 718, 1436, 4667

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 100100011101100

Octal: 44354

Duodecimal: A978

Hexadecimal: 48ec

Square: 348494224

Square Root: 136.63088962602856

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

Revert transform of ((x - 1)(x + 1))/(-1 - x + x³). A49130

Numbers n such that 6·10ⁿ-1 is prime. A56716

Position of 5ⁿ in A051037 (5-smooth numbers). A188427

Potential magic constants of 8 X 8 magic squares composed of consecutive primes. A189188

Partial sums of the second power of arithmetic derivative function A003415. A231864

Number of subsets of { 1, ..., n } containing an A.P. of length 7. A18792

Number of Dyck paths of semilength n avoiding the consecutive steps UDUUDU (with U=(1,1), D=(1,-1)). A243412

Irregular triangle read by rows: T(n,k) is the number of internal vertices in the graph A371254(n) that are created by the crossing of k arcs, with k>=2. A371264

Divisors of 826. A18668