Properties of the Number 42005

Forty-Two Thousand Five

Basics

Value: 42004 → 42005 → 42006

Parity: odd

Prime: No

Previous Prime: 41999

Next Prime: 42013

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 5 × 31 × 271

Divisors: 1, 5, 31, 155, 271, 1355, 8401, 42005

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 1010010000010101

Octal: 122025

Duodecimal: 20385

Hexadecimal: a415

Square: 1764420025

Square Root: 204.95121370706738

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 composite numbers up to n is palindromic. A57959

Solution of the complementary equation a(n) = a(n-1) + a(n-3) + a(n-4) + b(n-2), where a(0) = 1, a(1) = 2, a(2) = 3, a(3) = 4, b(0) = 5, b(1) = 6, b(2) = 7, b(3) = 8, and (a(n)) and (b(n)) are increasing complementary sequences. A295756

Numbers k such that (94·10^k + 11)/3 is prime. A280019

Denominators of continued fraction convergents to sqrt(525). A42005