Properties of the Number 389

Three Hundred Eighty-Nine

Basics

Value: 388 → 389 → 390

Parity: odd

Prime: Yes

Previous Prime: 383

Next Prime: 397

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 389

Divisors: 1, 389

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110000101

Octal: 605

Duodecimal: 285

Hexadecimal: 185

Square: 151321

Square Root: 19.72308292331602

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

Primes of the form x² + xy + 2y², with·and y nonnegative. A106856

Pythagorean primes: primes of the form 4·k + 1. A2144

Emirps (primes whose reversal is a different prime). A6567

Primes with primitive root 2. A1122

Primes congruent to 1 or 2 modulo 4; or, primes of form x² + y²; or, -1 is a square mod p. A2313

Primes of the form 3n-1. A3627

Primes of the form 6k-1. A7528

Single (or isolated or non-twin) primes: Primes p such that neither p-2 nor p+2 is prime. A7510

Self numbers or Colombian numbers (numbers that are not of the form m + sum of digits of m for any m). A3052

Primes whose reversal in base 10 is also prime (called "palindromic primes" by David Wells, although that name usually refers to A002385). Also called reversible primes. A7500