Properties of the Number 18500

Eighteen Thousand Five Hundred

Basics

Value: 18499 → 18500 → 18501

Parity: even

Prime: No

Previous Prime: 18493

Next Prime: 18503

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 2 ² × 5 ³ × 37

Divisors: 1, 2, 4, 5, 10, 20, 25, 37, 50, 74

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 100100001000100

Octal: 44104

Duodecimal: A858

Hexadecimal: 4844

Square: 342250000

Square Root: 136.01470508735443

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 integer partitions of n whose run-lengths are either weakly increasing or weakly decreasing. A332745

Triangle by rows T(n,k), showing the number of meanders with length (n+1)*3 and containing (k+1)*3 L's and (n-k)*3 R's, where L's and R's denote arcs of equal length and a central angle of 120 degrees which are positively or negatively oriented. A194595

a(n) = (A278399(n)² + A278400(n)²)/2. A278420

T(n,k)=Number of nXk 0..1 arrays with every element equal to 1, 2, 3, 4 or 7 king-move adjacent elements, with upper left element zero. A298547

Positions where A163890 obtains distinct new values. A163891

Square array A(n,k), n>=1, k>=1, read by antidiagonals: A(n,k) is the number of n-colorings of the complete bipartite graph K_k,k. A212085

Practical numbers z such that z² = x² + y² for some practical numbers·and y with gcd(x,y,z) = 4. A294112

a(n) is the number of 5 element sets of distinct integer-sided trapezoids whose base angles are 60 degrees that fill an equilateral triangular grid of side n units with a trapezoid filled by 3 trapezoids. A391204

a(n) = sigma₂(3·n). A283237

Even numbers n such that 37² (the square of the first irregular prime) divides the numerator of Bernoulli(n). A90789