Properties of the Number 18686

Eighteen Thousand Six Hundred Eighty-Six

Basics

Value: 18685 → 18686 → 18687

Parity: even

Prime: No

Previous Prime: 18679

Next Prime: 18691

Digit Sum: 29

Digital Root: 2

Palindrome: No

Factorization: 2 × 9343

Divisors: 1, 2, 9343, 18686

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100100011111110

Octal: 44376

Duodecimal: A992

Hexadecimal: 48fe

Square: 349166596

Square Root: 136.69674465765453

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

Numbers k with property that for every base b >= 2, there is a number m such that m+s(m) = k, where s(m) = sum of digits in the base-b expansion of m. A230624

a(n) = ∑_k=0..2·n/3 C(n-k,2·k-n)². A298567

a(n) = dot product of row n in Catalan triangle A033184 with row n in Pascal's triangle. A116363

Central coefficients of triangle A096815. A212421

Numbers k such that 6!*(2·k-7)!/(k!*(k-1)!) is an integer. A4786

Binomial transform of the "1,2,3,..." triangle. A125027

Numbers k such that 7!*(2k-8)!/(k!*(k-1)!) is an integer. A4787

Number of walks within N³ (the first octant of Z³) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, 1), (-1, 1, -1), (0, 0, -1), (1, 0, 0)}. A148124

Binomial sums: a(n) = ∑_{k=0..floor(n/3)} binomial(n-k,2·k)². A191349

Numbers n such that 4n+3 is a palindromic prime. A193419