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Properties of the Number 18688

Eighteen Thousand Six Hundred Eighty-Eight

Basics

Value: 18687 → 18688 → 18689

Parity: even

Prime: No

Previous Prime: 18679

Next Prime: 18691

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

2196 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 phi7, 4(x) where phir, s(x) = ∑n, m>0 mr * ns * xm·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