Properties of the Number 1818

One Thousand Eight Hundred Eighteen

Basics

Value: 1817 → 1818 → 1819

Parity: even

Prime: No

Previous Prime: 1811

Next Prime: 1823

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

Today's Target

2196 Try Today's Challenge

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

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

a(n) = 4·a(n-1) + n with n > 1, a(1)=1. A14825

Numbers m such that there are precisely 10 groups of order m. A249553

Expansion of 1 / f(-x¹, -x⁵) in powers of·where f() is Ramanujan's two-variable θ function. A195848