Properties of the Number 42440

Forty-Two Thousand Four Hundred Forty

Basics

Value: 42439 → 42440 → 42441

Parity: even

Prime: No

Previous Prime: 42437

Next Prime: 42443

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 2 ³ × 5 × 1061

Divisors: 1, 2, 4, 5, 8, 10, 20, 40, 1061, 2122

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 1010010111001000

Octal: 122710

Duodecimal: 20688

Hexadecimal: a5c8

Square: 1801153600

Square Root: 206.00970850908945

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

Sum of 10 positive 9th powers. A3399

Expansion of ∏_k>=1 (1 + x^k²)²/(1 - x^k²)². A279227

Number of iterations to reach a final state for an n X n lattice of sandpiles on a torus according to rules specified in the comment section. A249872

Riordan array (1/(1-3x·c(x)),xc(x)), c(x) the g.f. of A000108. A117375

Powers of sqrt(21) rounded up. A17969

n written in fractional base 6/4. A24637

a(n) = 31·n² + 1. A247155

Powers of fourth root of 21 rounded up. A18107

Fifth convolution of A001045(n+1) (generalized (1,2)-Fibonacci), n>=0, with itself. A73375

Numerators of continued fraction convergents to sqrt(748). A42440