Properties of the Number 39809

Thirty-Nine Thousand Eight Hundred Nine

Basics

Value: 39808 → 39809 → 39810

Parity: odd

Prime: No

Previous Prime: 39799

Next Prime: 39821

Digit Sum: 29

Digital Root: 2

Palindrome: No

Factorization: 7 × 11 ² × 47

Divisors: 1, 7, 11, 47, 77, 121, 329, 517, 847, 3619

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1001101110000001

Octal: 115601

Duodecimal: 1B055

Hexadecimal: 9b81

Square: 1584756481

Square Root: 199.5219286193876

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 compositions of n into distinct parts where each part i is marked with a word of length i over a binary alphabet whose letters appear in alphabetical order and all letters occur at least once in the composition. A261853

Integer part of 2ⁿ/log(2ⁿ). A141602

Number of nX5 0..1 arrays with every element equal to 3, 4, 5, 6 or 8 king-move adjacent elements, with upper left element zero. A298899

Reversion of y - y² - y³ + y⁴ - y⁵. A63027

T(n,k)=Number of nXk 0..1 arrays with every element equal to 3, 4, 5, 6 or 8 king-move adjacent elements, with upper left element zero. A298902

For n > 1, a(n) doubles under the transform T, where Ta is the matrix product of partition triangle A008284 with a, with a(1) = 1. A39809