Properties of the Number 40809

Forty Thousand Eight Hundred Nine

Basics

Value: 40808 → 40809 → 40810

Parity: odd

Prime: No

Previous Prime: 40801

Next Prime: 40813

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 61 × 223

Divisors: 1, 3, 61, 183, 223, 669, 13603, 40809

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1001111101101001

Octal: 117551

Duodecimal: 1B749

Hexadecimal: 9f69

Square: 1665374481

Square Root: 202.0123758585102

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

Number of solutions to c(1)*prime(4) + c(2)*prime(5) + ... + c(2n-1)*prime(2n+2) = -1, where c(i) = +-1 for i>1, c(1) = 1. A261045

Number of (w,x,y,z) with all terms in {1,...,n} and w > harmonic mean of {x,y,z}. A212105

Rectangular array pos(i,j,1,2) read by descending antidiagonals: pos( ) and neg() denote the positive part and negative part of a determinant; see Comments. A380660

Least k such that k·M(n)*M(n+4) + 1 is prime, where M(n) = A000668(n). A365065

Continued fraction for sqrt(838). A40809