Properties of the Number -18986

Eighteen Thousand Nine Hundred Eighty-Six

Basics

Value: -18987 → -18986 → -18985

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

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