Properties of the Number 638

Six Hundred Thirty-Eight

Basics

Value: 637 → 638 → 639

Parity: even

Prime: No

Previous Prime: 631

Next Prime: 641

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 2 × 11 × 29

Divisors: 1, 2, 11, 22, 29, 58, 319, 638

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1001111110

Octal: 1176

Duodecimal: 452

Hexadecimal: 27e

Square: 407044

Square Root: 25.25866188063018

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 strict knapsack partitions of n. A275972

Number of unimodular 2 X 2 matrices having all terms in {0,1,...,n}. A210000

Increasing sequence generated by these rules: a(1)=1, and if·is in a then 3x-2 and 4x-2 are in a. A191113

a(n) = 2^n-1 + ((1 + (-1)ⁿ)/4)*binomial(n, n/2). A27306

Centered heptagonal numbers. A69099

a(n) = ∑_i=0..n binomial(2·n, i). A32443

Expansion of ((1 + x - 2x²) + (1+x)*sqrt(1-4x²))/(2(1-4x²)). A116406

Number of partitions of n such that no part is a sum of two other parts. A236912

a(n) = 4·n² - 3·n + 1. A54552

Sums of four consecutive primes. A34963