Properties of the Number 18218

Eighteen Thousand Two Hundred Eighteen

Basics

Value: 18217 → 18218 → 18219

Parity: even

Prime: No

Previous Prime: 18217

Next Prime: 18223

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 2 × 9109

Divisors: 1, 2, 9109, 18218

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100011100101010

Octal: 43452

Duodecimal: A662

Hexadecimal: 472a

Square: 331895524

Square Root: 134.97407158413796

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

Maximal number of regions into which 4-space can be divided by n hyperspheres. A59173

Numbers n such that n!8-1 is prime. A204662

T(n,k)=Number of nXk 0..3 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 4, and upper left element zero. A230250

a(n) = ∑_k=1..n-1 sigma₅(k)*sigma₅(n-k). A279889

Number of distinct hook length sets of partitions of n. A301512

Expansion of ∏_k>=1 1/((1 - x^k)*(1 - x^5·k)). A318028

Convolution of Lucas numbers and primes. A23625

Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 11. A31599

Number of nondecreasing arrangements of n+3 numbers in 0..3 with each number being the sum mod 4 of three others. A183898

Number of nX4 0..3 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 4, and upper left element zero. A230247