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Properties of the Number 18638

Eighteen Thousand Six Hundred Thirty-Eight

Basics

Value: 18637 → 18638 → 18639

Parity: even

Prime: No

Previous Prime: 18637

Next Prime: 18661

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 2 × 9319

Divisors: 1, 2, 9319, 18638

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100100011001110

Octal: 44316

Duodecimal: A952

Hexadecimal: 48ce

Square: 347375044

Square Root: 136.52106064633398

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

Denominators of convergents to π by Farey fractions. A63673
Number of partitions of n that have even-sized Ferrers matrix. A238945
Number of odd singletons in all partitions of n (n>=0). A265257
Solution of the complementary equation a(n) = a(n-1) + a(n-2) + n·b(n), where a(0) = 1, a(1) = 4, b(0) = 2, b(1) = 3, b(2) = 5, and (a(n)) and (b(n)) are increasing complementary sequences. A296295
McKay-Thompson series of class 39B for Monster. A58660
Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 173", based on the 5-celled von Neumann neighborhood. A270467
Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 238", based on the 5-celled von Neumann neighborhood. A270986
Numbers that can be written in exactly two different ways in the form described by A387302. A387898
a(0) = 1, a(1) = 2, a(2) = 5; for n >= 3, a(n) = a(n - 1) - 2·a(n - 2) + a(n - 3). A121311
a(n) = prime(n+1)2 - prime(n). A261465