Properties of the Number 42665

Forty-Two Thousand Six Hundred Sixty-Five

Basics

Value: 42664 → 42665 → 42666

Parity: odd

Prime: No

Previous Prime: 42649

Next Prime: 42667

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 5 × 7 × 23 × 53

Divisors: 1, 5, 7, 23, 35, 53, 115, 161, 265, 371

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 1010011010101001

Octal: 123251

Duodecimal: 20835

Hexadecimal: a6a9

Square: 1820302225

Square Root: 206.55507740067782

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 3·2^k + 1 is prime. A2253

Numbers n such that 3·2ⁿ + 1 is a prime factor of a generalized Fermat number 12^{2^m} + 1 for some m. A268660

Numbers k such that (k, σ(k)) lies on a circle with integral radius centered at the origin, i.e., k² + σ(k)² is a square. A66764

Monotonic ordering of nonnegative differences 9ⁱ-2^j, for 40>= i>=0, j>=0. A192123

Monotonic ordering of nonnegative differences 3ⁱ-4^j, for 40>= i>=0, j>=0. A192147

Monotonic ordering of nonnegative differences 9ⁱ-4^j, for 40>= i>=0, j>=0. A192170

Odd squarefree numbers n such that the cyclotomic polynomial φ(n,x) is not coefficient convex. A146960

Numbers k such that 3·2^k + 1 is a prime factor of a generalized Fermat number 7^{2^m} + 1 for some m. A282943

a(n) = n⁷*(n³ + 1)/2. A168660

Denominators of continued fraction convergents to sqrt(862). A42665