Properties of the Number 18045

Eighteen Thousand Forty-Five

Basics

Value: 18044 → 18045 → 18046

Parity: odd

Prime: No

Previous Prime: 18043

Next Prime: 18047

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 5 × 401

Divisors: 1, 3, 5, 9, 15, 45, 401, 1203, 2005, 3609

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100011001111101

Octal: 43175

Duodecimal: A539

Hexadecimal: 467d

Square: 325622025

Square Root: 134.33167906342868

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

Numbers k such that k-4, k-2, k+2 and k+4 are prime. A173037

Expansion of ∏_m>=1 (1+q^m)^-9. A22604

Triangle T(n, k, q) = binomial(n, k) + qⁿ*binomial(n-2, k-1) - 1 with T(n, 0) = T(n, n) = 1 and q = 2, read by rows. A173046

a(n) = n! * [xⁿ] (exp(x)+x)ⁿ. A245496

Numbers k(n) used for Markoff forms determining quadratic irrationals with purely periodic continued fractions. A305311

Partial sums of floor(n³/2). A173704

Numbers k > 0 such that either 3·k+4, k-2, k+2, n+k or 3·k+5, k-1, k+1, k+5 are all primes. A290130

Powers of cube root of 24 rounded down. A18045

Integers k for which there exists some integer m such that the sum of the digits of m^k is equal to m + k. A353159

a(n) = 5·401*(10ⁿ + 1). A107285