Properties of the Number 39805

Thirty-Nine Thousand Eight Hundred Five

Basics

Value: 39804 → 39805 → 39806

Parity: odd

Prime: No

Previous Prime: 39799

Next Prime: 39821

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 5 × 19 × 419

Divisors: 1, 5, 19, 95, 419, 2095, 7961, 39805

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 1001101101111101

Octal: 115575

Duodecimal: 1B051

Hexadecimal: 9b7d

Square: 1584438025

Square Root: 199.51190440672957

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

a(0) = 0 and a(n) = (4·n³ - 12·n² + 20·n - 9)/3 for n >= 1. A174794

G.f. A(x) satisfies: A(x) = (1 + x·A(x)³) / (1 - 4·x). A349515

E.g.f. satisfies A(x) = x·exp( 2·A(x) + x·exp(2·A(x)) ). A360471

E.g.f. A(x) satisfies: A( x - x²/2 - ∑_n>=3 (n-3)!*xⁿ/n! ) = x. A209923

Matrix cube of partition triangle A008284. A39805