Properties of the Number -1818

Eight Hundred Eighteen

Basics

Value: -1819 → -1818 → -1817

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 × 3 ² × 101

Divisors: 1, 2, 3, 6, 9, 18, 101, 202, 303, 606

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -11100011010

Octal: -3432

Duodecimal: -1076

Hexadecimal: -71a

Square: 3305124

Square Root: 42.638011210655684

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

Expansion of 1/(2 - ∏_k>=1 (1 - x^k)). A307059

Array: row n shows the coefficients of the characteristic polynomial of the n-th principal submatrix of the symmetric matrix A115216; by antidiagonals. A202868

Binomial transform of reflected pentanacci numbers A074062: a(n) = ∑_k=0..n binomial(n,k)*A074062(k). A74825

Doublets: base-10 representation is the juxtaposition of two identical strings. A20338

Number of strict integer partitions of n with integer median. A359907

Numbers n such that n³² + 1 is prime. A6315

Multiples of 18 containing a 18 in their decimal representation. A121038

Coordination sequence for (3,4,4) tiling of hyperbolic plane. A265075

Number of integer partitions of n of even rank. A340601

Numbers k such that 2^k - 5 is prime. A59608