Properties of the Number 18884

Eighteen Thousand Eight Hundred Eighty-Four

Basics

Value: 18883 → 18884 → 18885

Parity: even

Prime: No

Previous Prime: 18869

Next Prime: 18899

Digit Sum: 29

Digital Root: 2

Palindrome: No

Factorization: 2 ² × 4721

Divisors: 1, 2, 4, 4721, 9442, 18884

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100100111000100

Octal: 44704

Duodecimal: AB18

Hexadecimal: 49c4

Square: 356605456

Square Root: 137.41906709041507

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

a(0)=0, a(1)=1, a(2)=1, a(3)=1, a(n) = a(n-3) + a(n-4) for n > 3. A79398

Square array A(n,k), n>=1, k>=1, read by antidiagonals, with A(1,k)=1 and sequence a_k of column k shifts left when Dirichlet convolution (DC:(b,b)->a) applied k times. A144324

Square array A(n,k), n>=1, k>=1, read by antidiagonals, with A(1,k)=1 and sequence a_k of column k shifts left when Dirichlet convolution with a_k (DC:(b,a_k)->a) applied k times. A144823

The limiting sequence [A259095(r(r+1)/2-s,r), s=0,1,2,...,r-1] for very large r. A5576

Numbers n such that (10ⁿ-1)²-2 is prime. A100903

Shifts left when Dirichlet convolution (DC:(b,b)->a) applied twice. A144316

Smallest m such that the n-th odd prime is the smallest prime for all decompositions of 2·m into two primes. A208662

Number of permutations of [n] avoiding the patterns 2-41-3, 3-14-2, 2-14-3, and 3-41-2. A348351

a(n) = floor(n(n-1)(n-2)(n-3)/19). A11929

a(n) = ∑_k=m..n T(k,n-k), where m = floor((n+1)/2); a(n) is the n-th diagonal-sum of left justified array T given by A027935. A27947