Properties of the Number 18986

Eighteen Thousand Nine Hundred Eighty-Six

Basics

Value: 18985 → 18986 → 18987

Parity: even

Prime: No

Previous Prime: 18979

Next Prime: 19001

Digit Sum: 32

Digital Root: 5

Palindrome: No

Factorization: 2 × 11 × 863

Divisors: 1, 2, 11, 22, 863, 1726, 9493, 18986

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100101000101010

Octal: 45052

Duodecimal: ABA2

Hexadecimal: 4a2a

Square: 360468196

Square Root: 137.78969482512107

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

a(n) is twice the smallest k such that A051686(k) = prime(n). A51692

Twice the positions in A051686 at which new primes appear in that sequence. A51861

Fibonacci sequence beginning 2, 18. A22371

Sum of composite numbers up to n is palindromic. A57959

Triangle T(n,k) read by rows: number of unordered increasing trees on n nodes, with k nodes colored blue and n-k nodes colored red, such that each red node has at least two children. A393523

Numbers k divisible by exactly two nontrivial permutations (rearrangements) of the digits of k, excluding all permutations that result in digit loss. A90061

Cycle class sequence c(2n) (the number of true cycles of length 2n in which a certain node is included) for zeolite ATS = MAPO-36 H[MgAl11P12O48] starting with a T2 atom. A18986