Properties of the Number 18158

Eighteen Thousand One Hundred Fifty-Eight

Basics

Value: 18157 → 18158 → 18159

Parity: even

Prime: No

Previous Prime: 18149

Next Prime: 18169

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 2 × 7 × 1297

Divisors: 1, 2, 7, 14, 1297, 2594, 9079, 18158

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100011011101110

Octal: 43356

Duodecimal: A612

Hexadecimal: 46ee

Square: 329712964

Square Root: 134.75162336684483

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

G.f.: ∏_k>=1 (1 + 2·x^k²) / (1-x^k). A280224

Least k such that ∑_i=1..k 1/φ(i) >= n. A74467

Floor( φ * (3/2)ⁿ ) where φ = (1+sqrt(5))/2. A81226

Number of words either empty or beginning with the first letter of the cyclic n-ary alphabet, where each letter of the alphabet occurs twice and letters of neighboring word positions are equal or neighbors in the alphabet. A208880

Concatenation of n-th prime and n-th nonprime. A253910

a(n) = ∑_k=1..n k²*sigma₂(k), where sigma₂ is A001157. A364268

Numbers k such that there exists i >= 1 such that k divides 3³^i + 1. A367266

Powers of fifth root of 15 rounded up. A18158