Properties of the Number 393

Three Hundred Ninety-Three

Basics

Value: 392 → 393 → 394

Parity: odd

Prime: No

Previous Prime: 389

Next Prime: 397

Digit Sum: 15

Digital Root: 6

Palindrome: Yes

Factorization: 3 × 131

Divisors: 1, 3, 131, 393

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110001001

Octal: 611

Duodecimal: 289

Hexadecimal: 189

Square: 154449

Square Root: 19.82422760159901

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

Palindromes in base 10. A2113

Numbers k such that (35·10^k - 11)/3 is prime. A268448

Central trinomial coefficients: largest coefficient of (1 + x + x²)ⁿ. A2426

Triangle of trinomial coefficients T(n,k) (n >= 0, 0 <= k <= 2·n), read by rows: n-th row is obtained by expanding (1 + x + x²)ⁿ. A27907

Antisigma(n): Sum of the numbers less than n that do not divide n. A24816

Number of ordered triples (w,x,y) with all terms in {-n,...,0,...,n} and w² + x·y = 0. A211422

a(n) = 2·n² + 1. A58331

a(n) = 8·n + 1. A17077

First differences of A025475, powers of a prime but not prime. A53707

In the sequence of prime numbers, replace all the '3' digits with '1' and vice versa. A175770