Properties of the Number 39808

Thirty-Nine Thousand Eight Hundred Eight

Basics

Value: 39807 → 39808 → 39809

Parity: even

Prime: No

Previous Prime: 39799

Next Prime: 39821

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 2 ⁷ × 311

Divisors: 1, 2, 4, 8, 16, 32, 64, 128, 311, 622

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1001101110000000

Octal: 115600

Duodecimal: 1B054

Hexadecimal: 9b80

Square: 1584676864

Square Root: 199.51942261343882

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) = n! - n³. A7339

T(n,k) = Number of n X k 0..1 arrays with every element unequal to 0, 1, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. A326165

Decimal representation of the diagonal from the corner to the origin of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 366", based on the 5-celled von Neumann neighborhood. A287854

G.f.: 1/(1-6·x+8·x³). A111989

Expansion of e.g.f. 1/(1 - x·log(1 + x + x²)). A371225

Triangle read by rows: T(n, k) is the number of singular meanders with n intersections having k tangential intersections. A391919

Numbers k such that k = Product (p_j^e_j) = Product (π(p_j)*p_j), where π() = A000720. A304194

Number of nX6 0..1 arrays with every element unequal to 0, 1, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. A326163

Number of n X n 0..1 arrays with every element unequal to 0, 1, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. A326159

The least nonnegative integer N such that n·N has the same digits as n and N together, not counting repetitions. A266586