Properties of the Number 18922

Eighteen Thousand Nine Hundred Twenty-Two

Basics

Value: 18921 → 18922 → 18923

Parity: even

Prime: No

Previous Prime: 18919

Next Prime: 18947

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 2 × 9461

Divisors: 1, 2, 9461, 18922

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100100111101010

Octal: 44752

Duodecimal: AB4A

Hexadecimal: 49ea

Square: 358042084

Square Root: 137.55726080436466

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) = ∑_{k=0..floor(n/4)} 2^n-4·k * binomial(2·n-6·k+1,2·k+1). A387696

a(0) = 1; a(n) = ∑_{k=0..floor((n-1)/2)} (-3)^k * a(k) * a(n-2·k-1). A352010

Numbers k such that the continued fraction for sqrt(k) has period 81. A20420

Row sums of the Riordan array (1/(1+x),x(1+2x)/(1+x)³)^-1. A138175

E.g.f. A(x) satisfies: A(x) = sqrt( ∑_n>=0 (xⁿ/n!) * exp(x·A(x)ⁿ) ). A341379

Numbers k such that (55·10^k + 377)/9 is prime. A294230

Define the generalized Pisot sequence T(a(0),a(1)) by: a(n+2) is the greatest integer such that a(n+2)/a(n+1) < a(n+1)/a(n). This is T(8,16). A18922