Properties of the Number 18

Eighteen

Basics

Value: 17 → 18 → 19

Parity: even

Prime: No

Previous Prime: 17

Next Prime: 19

Digit Sum: 9

Digital Root: 9

Palindrome: No

Factorization: 2 × 3 ²

Divisors: 1, 2, 3, 6, 9, 18

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: Yes

Tetrahedral: No

Today's Target

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Representations

Binary: 10010

Octal: 22

Duodecimal: 16

Hexadecimal: 12

Square: 324

Square Root: 4.242640687119285

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: Yes

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

No sequences found.