Properties of the Number 25442

Twenty-Five Thousand Four Hundred Forty-Two

Basics

Value: 25441 → 25442 → 25443

Parity: even

Prime: No

Previous Prime: 25439

Next Prime: 25447

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 2 × 12721

Divisors: 1, 2, 12721, 25442

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 110001101100010

Octal: 61542

Duodecimal: 12882

Hexadecimal: 6362

Square: 647295364

Square Root: 159.5054857990784

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

Becomes prime after n iterations of f(x) = σ(x)-1 (least inverse of A039655). A39656

Expansion of 1 / ∏_{k >= 1} (1-q^k)²*(1-q^11k)². A32442

The number of unlabeled graphs on n nodes with degree of 1 or 2. A186417

The number of 4-alternating permutations of [n]. A250259

Number of proper factorizations of p1ⁿ*p2², where p1 and p2 are distinct primes. A31125

Numbers n for which there are exactly ten k such that n = k + reverse(k). A72434

Number of (n+2) X (4+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 00000101 or 00000111. A261707

a(n) = 2^-n*∑_k=0..n binomial(2·n+1, 2·k+1)*A000364(n-k). A111196

Number of partitions of n into 3 distinct nonzero squares. A25442