Properties of the Number 18405

Eighteen Thousand Four Hundred Five

Basics

Value: 18404 → 18405 → 18406

Parity: odd

Prime: No

Previous Prime: 18401

Next Prime: 18413

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 5 × 409

Divisors: 1, 3, 5, 9, 15, 45, 409, 1227, 2045, 3681

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100011111100101

Octal: 43745

Duodecimal: A799

Hexadecimal: 47e5

Square: 338744025

Square Root: 135.66502865514016

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

Number of distinct topologies on an n-set that have exactly 4 open sets. A281773

Numbers n such that σ(n)² - φ(n)² is a perfect square. A57654

Divisors of 348. A18405