Properties of the Number 39991

Thirty-Nine Thousand Nine Hundred Ninety-One

Basics

Value: 39990 → 39991 → 39992

Parity: odd

Prime: No

Previous Prime: 39989

Next Prime: 40009

Digit Sum: 31

Digital Root: 4

Palindrome: No

Factorization: 7 × 29 × 197

Divisors: 1, 7, 29, 197, 203, 1379, 5713, 39991

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 1001110000110111

Octal: 116067

Duodecimal: 1B187

Hexadecimal: 9c37

Square: 1599280081

Square Root: 199.9774987342326

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 k³ divides 6^k² + 1. A128680

a(n) = (1 - (-6)ⁿ)/7. A14987

Numbers k such that 3^k + 22 is prime. A219042

Triangle of q-binomial coefficients for q=-6. A15116

a(n) = 5·a(n-1) + 6·a(n-2), a(0) = 0, a(1) = 1. A15540

Numbers k such that k | 6^k + 1. A15953

a(n) = n⁶ - n⁵ + n⁴ - n³ + n² - n + 1. A60888

a(n) = ∑_k=0..n (-1)^n-k*n^k. A81209

Cyclotomic polynomials at x=6. A19324

Expansion of the e.g.f. sqrt(1 / (2·exp(x) - 2·x*exp(x) - 1)). A345697