Properties of the Number 18750

Eighteen Thousand Seven Hundred Fifty

Basics

Value: 18749 → 18750 → 18751

Parity: even

Prime: No

Previous Prime: 18749

Next Prime: 18757

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 2 × 3 × 5 ⁵

Divisors: 1, 2, 3, 5, 6, 10, 15, 25, 30, 50

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 100100100111110

Octal: 44476

Duodecimal: AA26

Hexadecimal: 493e

Square: 351562500

Square Root: 136.93063937629154

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: Yes

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

Expansion of (1+x)/(1-5·x). A3948

A run-length describing inverse to A181819. The multiplicity of prime(k) in a(n) is the k-th smallest prime index of n, which is A112798(n,k). A304660

Hypotenuses for which there exist exactly 5 distinct Pythagorean triangles. A84649

Dispersion of A008587 (5,10,15,20,25,30,...), by antidiagonals. A191702

Triangle read by rows: coefficients T(n,k) of a binomial decomposition of 1 as ∑_k=0..n T(n,k)*binomial(n,k). A244116

Triangle read by rows: terms of a binomial decomposition of 0^n-1 as Sum(k=0..n)T(n,k). A244129

Triangle read by rows: terms T(n,k) of a binomial decomposition of nⁿ as Sum(k=0..n)T(n,k). A244137

a(n) = n*(n-1)^n-1. A55897

a(n) = n·5^n-1. A53464

Third step in Goodstein sequences, i.e., g(5) if g(2)=n: write g(4)=A057650(n) in hereditary representation base 4, bump to base 5, then subtract 1 to produce g(5). A59934