Properties of the Number 18864

Eighteen Thousand Eight Hundred Sixty-Four

Basics

Value: 18863 → 18864 → 18865

Parity: even

Prime: No

Previous Prime: 18859

Next Prime: 18869

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 2 ⁴ × 3 ² × 131

Divisors: 1, 2, 3, 4, 6, 8, 9, 12, 16, 18

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 100100110110000

Octal: 44660

Duodecimal: AB00

Hexadecimal: 49b0

Square: 355850496

Square Root: 137.34627770711518

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

Expansion of e.g.f. 1/(1 - arctanh(x)). A296676

Denominators of convergents to π by Farey fractions. A63673

a(n) = ∑_i=0..n digsum₇(i)³, where digsum₇(i) = A053828(i). A231678

Sum of divisors of prime(n)! / prime(n)# + 1. A103895

L.g.f.: ∑_n>=1 x^(2·n-1²) / ( (2·n-1) * (1 - x^2·n)^2·n-1 ). A293598

Number of permutations of [n] whose cycle minima sum to n. A368246

Second convolution of A111989. A111991

Number of (w,x,y,z) with all terms in {1,...,n} and 3w = x + y + z + n + 1. A212251

Indices of primes in the sequence defined by A(0) = 47, A(n) = 10·A(n-1) - 33 for n > 0. A101724

a(n) = n⁴ - n³ - n². A132998