Properties of the Number 18685

Eighteen Thousand Six Hundred Eighty-Five

Basics

Value: 18684 → 18685 → 18686

Parity: odd

Prime: No

Previous Prime: 18679

Next Prime: 18691

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 5 × 37 × 101

Divisors: 1, 5, 37, 101, 185, 505, 3737, 18685

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100100011111101

Octal: 44375

Duodecimal: A991

Hexadecimal: 48fd

Square: 349129225

Square Root: 136.69308687713507

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

30-gonal numbers: a(n) = n*(14·n-13). A254474

a(n) = ∑_d∣n φ(d³). A68963

The number of distinct positions on an infinite chessboard reachable by the (2,3)-leaper (or zebra) in at most n moves. A297740

Triangle read by rows : inverse of triangle A339207. A339209

Numbers n such that the trinomial xⁿ-x-1 is irreducible over GF(3). A223938

Repunit pseudoprimes: composite numbers k such that (10^k - 1)/9 == 1 (mod k). A303608

Divisors of 855. A18685