Properties of the Number 18518

Eighteen Thousand Five Hundred Eighteen

Basics

Value: 18517 → 18518 → 18519

Parity: even

Prime: No

Previous Prime: 18517

Next Prime: 18521

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 2 × 47 × 197

Divisors: 1, 2, 47, 94, 197, 394, 9259, 18518

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100100001010110

Octal: 44126

Duodecimal: A872

Hexadecimal: 4856

Square: 342916324

Square Root: 136.08085831592922

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

Group the triangular numbers so that the n-th group sum is a multiple of n. 1, (3, 6, 10, 15), (21), (28), (36, 45, 55, 66, 78), (91, 105, 120, 136, 153, 171, 190), ... Sequence contains n-th group sum divided by n. A114032

a(n) = floor( (10ⁿ - 1) / (9·n) ). A89303

Number of right triangles on an (n+1) X 5 grid. A189809

Numbers k such that (28·10^k + 773)/9 is prime. A275522

Number of (n+1) X (4+1) 0..4 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 1, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings). A234878

a(n) is the quotient of the sum of (not necessarily distinct) integers i!+(prime(n)-1)!/i!, i=1,2,...,prime(n)-2, which are divisible by prime(n), and prime(n). A238692

Divisors of 558. A18518