Properties of the Number 19800

Nineteen Thousand Eight Hundred

Basics

Value: 19799 → 19800 → 19801

Parity: even

Prime: No

Previous Prime: 19793

Next Prime: 19801

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 ³ × 3 ² × 5 ² × 11

Divisors: 1, 2, 3, 4, 5, 6, 8, 9, 10, 11

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100110101011000

Octal: 46530

Duodecimal: B560

Hexadecimal: 4d58

Square: 392040000

Square Root: 140.71247279470288

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

θ series of A₁₁ lattice. A23902

Septuple factorial, 7-factorial, n!7, n!!!!!!!, a(n) = n·a(n-7) if n > 1, else 1. A114799

Totient of 2ⁿ+1. A53285

Coefficient triangle of generalized Laguerre polynomials n!*L(n,5,x)(rising powers of x). A62138

Partial products of successive terms of A017029; a(0)=1. A144827

Numbers k such that σ (x) = k has exactly 12 solutions. A60676

a(n) = φ(8ⁿ+1), where φ is Euler's totient function (A000010). A366658

Star of David matchstick numbers: a(n) = 6·n*(3·n+1). A45946

a(n) = 22·n². A195323

Even legs of Pythagorean triangles whose other leg and hypotenuse are both prime. A67755