Properties of the Number 42639

Forty-Two Thousand Six Hundred Thirty-Nine

Basics

Value: 42638 → 42639 → 42640

Parity: odd

Prime: No

Previous Prime: 42611

Next Prime: 42641

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 3 × 61 × 233

Divisors: 1, 3, 61, 183, 233, 699, 14213, 42639

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 1010011010001111

Octal: 123217

Duodecimal: 20813

Hexadecimal: a68f

Square: 1818084321

Square Root: 206.49213060065995

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

Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 41 ones. A31809

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 497", based on the 5-celled von Neumann neighborhood. A272558

Denominators of continued fraction convergents to sqrt(849). A42639

a(n) is the number of positive integer solutions of n·x*y·z*v·w = (x + n) * (y + n) * (z + n) * (v + n) * (w + n), x <= y <= z <= v <= w. A381644