Properties of the Number 18656

Eighteen Thousand Six Hundred Fifty-Six

Basics

Value: 18655 → 18656 → 18657

Parity: even

Prime: No

Previous Prime: 18637

Next Prime: 18661

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 2 ⁵ × 11 × 53

Divisors: 1, 2, 4, 8, 11, 16, 22, 32, 44, 53

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100100011100000

Octal: 44340

Duodecimal: A968

Hexadecimal: 48e0

Square: 348046336

Square Root: 136.586968631711

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) = (2·n-1)*(n² -n +2)/2. A63488

Triangle read by rows: T(n,k) (1<=k<=n) given by T(n, 1) = T(n,n) = 1, otherwise T(n, k) = (m·n-m·k+1)*T(n-1,k-1) + (m·k-m+1)*T(n-1,k), where m = 5. A142460

Total number of n-digit positive integers with multiplicative digital root value 5. A263479

Rook polynomials; fourth column of A008305. A4306

G.f.: ∑_n>=0 (n+1) * xⁿ * (1 + xⁿ)ⁿ. A326002

a(n+3) = a(n+2) + a(n+1) + a(n) - 4. A803

a(n) = 2662·n + 22. A157613

a(n) is least k such that k and 8k are anagrams in base n (written in base 10). A23100

Open 3-dimensional ball numbers (version 4): a(n) is the number of integer points (i,j,k) contained in an open ball of diameter n, centered at (1/2, 1/2, 1/2). A53596

3-apexes of ω: numbers k such that ω(k-3) < ω(k-2)< ω(k-1) < ω(k) > ω(k+1) > ω(k+2) > ω(k+3), where ω(m) = the number of prime factors of m, counting multiplicity. A76760