Properties of the Number -18688

Eighteen Thousand Six Hundred Eighty-Eight

Basics

Value: -18689 → -18688 → -18687

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 31

Digital Root: 4

Palindrome: No

Factorization: 2 ⁸ × 73

Divisors: 1, 2, 4, 8, 16, 32, 64, 73, 128, 146

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

4938 Try Today's Challenge

Representations

Binary: -100100100000000

Octal: -44400

Duodecimal: -A994

Hexadecimal: -4900

Square: 349241344

Square Root: 136.7040599250805

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

Products of the 8th power of a prime and a distinct prime (p⁸*q). A179668

T(n,k)=Number of nXk 0..3 arrays x(i,j) with each element horizontally, diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4 and at least one element with value (x(i,j)-1) mod 4, no adjacent elements equal, and upper left element zero. A231049

T(n,k)=Number of nXk 0..1 arrays avoiding 0 0 1 and 1 0 1 horizontally and 0 1 0 and 1 0 1 vertically. A207254

Values of n such that there are exactly 7 solutions to x² - y² = n with x > y >= 0. A257414

Expansion of phi_{7, 4}(x) where phi_{r, s}(x) = ∑_{n, m>0} m^r * n^s * x^m·n. A280025

From expansion of Belyi function for octahedron. A66405

Records in A114183. A222193

Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 246", based on the 5-celled von Neumann neighborhood. A287136

Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 461", based on the 5-celled von Neumann neighborhood. A288434

Positions of zeros in A345055, which is the Dirichlet inverse of A011772. A345053