Properties of the Number 19844

Nineteen Thousand Eight Hundred Forty-Four

Basics

Value: 19843 → 19844 → 19845

Parity: even

Prime: No

Previous Prime: 19843

Next Prime: 19853

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 2 ² × 11 ² × 41

Divisors: 1, 2, 4, 11, 22, 41, 44, 82, 121, 164

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100110110000100

Octal: 46604

Duodecimal: B598

Hexadecimal: 4d84

Square: 393784336

Square Root: 140.86873322352267

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

Number of regions in a regular drawing of the complete bipartite graph K_n,n. A290131

Greatest positive integer whose reversed (weakly decreasing) prime indices have weighted sum (A318283) equal to n. A359683

Squares where knight moving to a lowest unvisited square on a spirally numbered board will have no available moves. A323714

Number of nonequivalent ways to select 3 disjoint point triples from an n X n X n triangular point grid, each point triple forming a 2 X 2 X 2 triangle. A289230

Number of parts in all n-times partitions of n. A327619

a(n) = ∑_i=1..n σ(i)*σ(i+1), where σ(n) = A000203(n) is the sum of the divisors of n. A330322

Irregular table read by rows: T(n,k) is the number of k-gons, k>=3, among all distinct circles that can be constructed from the 4 vertices and the equally spaced 4·n points placed on the sides of a square, using only a compass. A372980

a(n) = (2·n - 3)n². A15238

Number of partitions p of n such that max(p)-min(p) = 9. A218572

Smallest k for which a chain of linked rods of length 1, ..., k can be folded in half in exactly n dictinct ways. A390056