Properties of the Number 19810

Nineteen Thousand Eight Hundred Ten

Basics

Value: 19809 → 19810 → 19811

Parity: even

Prime: No

Previous Prime: 19801

Next Prime: 19813

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 2 × 5 × 7 × 283

Divisors: 1, 2, 5, 7, 10, 14, 35, 70, 283, 566

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100110101100010

Octal: 46542

Duodecimal: B56A

Hexadecimal: 4d62

Square: 392436100

Square Root: 140.74800176201438

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

Weird numbers: abundant (A005101) but not pseudoperfect (A005835). A6037

Unitary weird numbers: unitary abundant (A034683) but not unitary pseudoperfect (A293188). A64114

Positions of 2's in A264977; positions of 3's in A277330. A277712

Bi-unitary weird numbers: bi-unitary abundant numbers (A292982) that are not bi-unitary pseudoperfect (A292985). A292986

Maximal length of rook tour on an n X n board. A6071

The Wiener index of a chain of n triangles (i.e., joined like VVV..VV; here V is a triangle!). A143941

Column 4 of A061315. A61319

Nonexponential weird numbers: nonexponential abundant numbers (A348604) that are not equal to the sum of any subset of their nonexponential divisors. A348631

Expansion of g.f. 1 - 2·x*(-7 - 10·x + x²)/(x - 1)⁴. A152100

(1+e)-weird numbers: (1+e)-abundant numbers k such that no subset of the aliquot (1+e)-divisors of k sums to k. A349285