Properties of the Number -18985

Eighteen Thousand Nine Hundred Eighty-Five

Basics

Value: -18986 → -18985 → -18984

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 31

Digital Root: 4

Palindrome: No

Factorization: 5 × 3797

Divisors: 1, 5, 3797, 18985

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -100101000101001

Octal: -45051

Duodecimal: -ABA1

Hexadecimal: -4a29

Square: 360430225

Square Root: 137.78606605894515

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

p-INVERT of (0,1,0,1,0,1,...), where p(S) = 1 - S - S³. A291219

Number of nonisomorphic unrooted Eulerian planar maps with n edges (Eulerian means that all vertices are of even valency; there is an Eulerian cycle). A69727

Expansion of ∏_k>=1 (1 + x^k - x^3·k) / (1 - x^k). A266650

Number of 2 X 2 matrices with all terms in {0,1,...,n} and even determinant. A210369

Positive numbers y such that y² is of the form x²+(x+727)² with integer x. A159893

Number of 2 X 2 matrices having all terms in {-n,...,0,..,n} and even determinant. A211154

Truncated hex numbers: a(n) = 24·n² + 6·n + 1. A381424

Numerators of continued fraction convergents to sqrt(177). A41326

Semiprime centered triangular numbers. A184481

Numbers k such that the continued fraction for sqrt(k) has period 93. A20432