Properties of the Number 18616

Eighteen Thousand Six Hundred Sixteen

Basics

Value: 18615 → 18616 → 18617

Parity: even

Prime: No

Previous Prime: 18593

Next Prime: 18617

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 2 ³ × 13 × 179

Divisors: 1, 2, 4, 8, 13, 26, 52, 104, 179, 358

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100100010111000

Octal: 44270

Duodecimal: A934

Hexadecimal: 48b8

Square: 346555456

Square Root: 136.4404632064843

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

a(n) = ∑_i=1..n F(i)^F(n-i+1). A113122

T(n,k) = Number of (n+1) X (k+1) binary arrays with no 2 X 2 subblock sum equal to any horizontal or vertical neighbor 2 X 2 subblock sum. A185798

Number of free hexagonal polygons of symmetry class C_2h and area n. A121210

Sophie Germain 5-almost primes. A211162

Szeged index of the grid graph P₃ X P_n. A245827

Numbers k such that 2·k² + 17 is a square. A144797

Number of (w,x,y) with all terms in {0,...,n} and |w-x| ≠ |x-y|. A212960

a(1) = 2; for n > 1, a(n) = a(n-1)*prime(n) if a(n-1) <= prime(n), otherwise a(n) = a(n-1) mod prime(n). A387775

Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 25 ones. A31793

Determinants of 3 X 3 matrices of discrete blocks of 9 consecutive primes. A117329