Properties of the Number 18089

Eighteen Thousand Eighty-Nine

Basics

Value: 18088 → 18089 → 18090

Parity: odd

Prime: Yes

Previous Prime: 18077

Next Prime: 18097

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 18089

Divisors: 1, 18089

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100011010101001

Octal: 43251

Duodecimal: A575

Hexadecimal: 46a9

Square: 327211921

Square Root: 134.4953530795767

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

Denominators of convergents to e. A7677

Number of length n inversion sequences avoiding the patterns 010 and 120. A279559

a(n) = n·a(n-1) + (n-5)*a(n-2). A1910

Bessel polynomial y_n(-2). A2119

a(n) = (1/n!)*A001689(n). A94794

Primes that become squares when prefixed with a 2. A167735

Primes p such that p-1 and p+1 each contain at least one cubed prime in their prime factorization. A162870

Denominators of upper primes-only best approximates (POBAs) to e; see Comments. A265817

Denominators of primes-only best approximates (POBAs) to e; see Comments. A265819

Table T(n,k) giving number of ways of obtaining exactly 0 correct answers on an (n,k)-matching problem (1 <= k <= n). A76731