Properties of the Number 39921

Thirty-Nine Thousand Nine Hundred Twenty-One

Basics

Value: 39920 → 39921 → 39922

Parity: odd

Prime: No

Previous Prime: 39901

Next Prime: 39929

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 3 × 7 × 1901

Divisors: 1, 3, 7, 21, 1901, 5703, 13307, 39921

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 1001101111110001

Octal: 115761

Duodecimal: 1B129

Hexadecimal: 9bf1

Square: 1593686241

Square Root: 199.8024023879593

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(n) = Fibonacci(2n+1) + n·2^n-1. A81663

Number of walks within N³ (the first octant of Z³) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 0, 1), (-1, 1, 0), (1, 0, -1), (1, 0, 0)}. A148634

Number of (n+1)Xn arrays containing n copies of 0..n+1-1 with every element equal to or 1 greater than any north, west or southwest neighbors modulo n and the upper left element equal to 0. A267339

Continued fraction expansion of w = 2·cos(π/7). A39921