Properties of the Number 25440

Twenty-Five Thousand Four Hundred Forty

Basics

Value: 25439 → 25440 → 25441

Parity: even

Prime: No

Previous Prime: 25439

Next Prime: 25447

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 2 ⁵ × 3 × 5 × 53

Divisors: 1, 2, 3, 4, 5, 6, 8, 10, 12, 15

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110001101100000

Octal: 61540

Duodecimal: 12880

Hexadecimal: 6360

Square: 647193600

Square Root: 159.49921629901507

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 A102489(k) is divisible by k. A32563

Strongly refactorable numbers: numbers n such that if n is divisible by d, it is divisible by the number of divisors of d. A141586

Numbers k such that σ(k) AND 3·k = 3·k, where AND is bitwise-and, A004198. A388022

Numbers of the form p⁵*q·r*s where p, q, r, and s are distinct primes. A179704

Oblong composite numbers m such that β(m) = τ(m)/2 - 1 where β(m) is the number of Brazilian representations of m and τ(m) is the number of divisors of m. A326384

Expansion of e.g.f. 2/(7 - 5·exp(2·x)). A384524

Row sums of A163357 and A163359. A163365

a(n) = σ(2·n³) - σ(n³). A225959

p-INVERT of (0,1,0,1,0,1,...), where p(S) = (1 - 3 S)². A291232

Coefficient of q² in ν(n), where ν(0) = 1, ν(1) = b and, for n >= 2, ν(n) = b*ν(n-1) + λ*(1 + q + q² + ... + q^{n - 2})*ν(n-2) with (b,λ) = (2,1). A74085