Properties of the Number 42805

Forty-Two Thousand Eight Hundred Five

Basics

Value: 42804 → 42805 → 42806

Parity: odd

Prime: No

Previous Prime: 42797

Next Prime: 42821

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 5 × 7 × 1223

Divisors: 1, 5, 7, 35, 1223, 6115, 8561, 42805

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 1010011100110101

Octal: 123465

Duodecimal: 20931

Hexadecimal: a735

Square: 1832268025

Square Root: 206.89369250897911

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 k through k+4 all have the same number of divisors. A49051

Table T(n,k) by antidiagonals: T(n,k) = number of partitions of n balls of k colors. A75196

G.f.: ∏_j>=1 1/(1-x^j)^binomial(j+4,4). A255052

a(n) = n³ - 2·n. A242135

Expansion of 1/(1-35·x+x²). A200724

Numbers k such that A(k+1) = A(k) + 3, where A() = A005100() are the deficient numbers. A317046

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 323", based on the 5-celled von Neumann neighborhood. A271255

Expansion of e.g.f. arcsin(log(x+1) - arcsin(x)). A13223

Expansion of e.g.f.: sinh(log(x+1)-arcsin(x))=-1/2!*x²+1/3!*x³-6/4!*x⁴+15/5!*x⁵... A13227

Denominators of continued fraction convergents to sqrt(933). A42805