Properties of the Number 25839

Twenty-Five Thousand Eight Hundred Thirty-Nine

Basics

Value: 25838 → 25839 → 25840

Parity: odd

Prime: No

Previous Prime: 25819

Next Prime: 25841

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 3 ⁴ × 11 × 29

Divisors: 1, 3, 9, 11, 27, 29, 33, 81, 87, 99

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 110010011101111

Octal: 62357

Duodecimal: 12B53

Hexadecimal: 64ef

Square: 667653921

Square Root: 160.74513989542575

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

Ruth-Aaron numbers (1): sum of prime divisors of n = sum of prime divisors of n+1. A6145

Number of polyominoes with n cells, symmetric about two orthogonal axes. A56877

Number of polyominoes of n cells with both horizontal and vertical symmetries, for which the 180-degree rotational symmetry has an axis that coincides with the center of a square, but without 90-degree rotational symmetry. A351190

Expansion of ∏_k>=1 (1 + 3·x^k)^k. A266857

Array read by rows: row n lists the coefficients of the characteristic polynomial of the n-th principal submatrix of max(2i-j, 2j-i), as in A204154. A204155

a(n) = [x^n*(n+1*(2·n+1)/6)] ∏_k=1..n ∑_m>=0 x^k²*m. A321186

Numbers k such that both k and k+1 are not exponentially squarefree numbers. A342188

Smallest k for which a chain of linked rods of length 1, ..., k can be folded in half in exactly n dictinct ways. A390056

The Wiener index of the Dutch windmill graph D(5,n) (n>=1). A180579

Triangle read by rows: T(n,k) = n·T(n-1,k) + (-1)^n-k for 0 <= k <= n with initial values T(n,k) = 0 if n < 0 or k < 0 or k > n. A352650