Properties of the Number 18819

Eighteen Thousand Eight Hundred Nineteen

Basics

Value: 18818 → 18819 → 18820

Parity: odd

Prime: No

Previous Prime: 18803

Next Prime: 18839

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 3 ³ × 17 × 41

Divisors: 1, 3, 9, 17, 27, 41, 51, 123, 153, 369

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100100110000011

Octal: 44603

Duodecimal: AA83

Hexadecimal: 4983

Square: 354154761

Square Root: 137.1823603820841

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 m such that 3·2^m - 1 is prime. A2235

Molien series for invariants of finite Coxeter group A₁₂. A266781

Numbers n such that n·x/(x-1) produces a rotation of the digits in n for some value of x. A288669

Row sums of triangle defined in A095181. A160915

Numbers of the form x² + y² + z² = φ(x·y*z) + σ(x·y*z). A173792

a(n) = (prime(n) - 1)*(prime(n+1) - 1)/2 + 3. A201498

Numbers k such that (k·2^d - 1)*(d·2^k - 1) is semiprime for some divisor d of k. A382646

Binary partition function: number of partitions of n into powers of 2. A18819

Diagonal of the rational function 1/(1 - x - y - z - x y + x y z). A274673