Properties of the Number 18984

Eighteen Thousand Nine Hundred Eighty-Four

Basics

Value: 18983 → 18984 → 18985

Parity: even

Prime: No

Previous Prime: 18979

Next Prime: 19001

Digit Sum: 30

Digital Root: 3

Palindrome: No

Factorization: 2 ³ × 3 × 7 × 113

Divisors: 1, 2, 3, 4, 6, 7, 8, 12, 14, 21

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100101000101000

Octal: 45050

Duodecimal: ABA0

Hexadecimal: 4a28

Square: 360392256

Square Root: 137.78243719719867

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

Nonprimes in the triangle A141020. A141031

The sum of the elements within a jump in a Sieve of Eratosthenes table. A179545

a(n) = ∑_k=1..n lcm(n,k). A51193

a(n) = 7·6*5·4*3·2*1 - 14·13·12·11·10·9*8 + 21·20·19·18·17·16·15 - ... + (up to the n-th term). A319890

Triangle read by rows: T(n,k) is the number of regions between the free polyominoes, with n cells and length k, and their bounding boxes, n >= 1, k >= 1. A380284

Sum of numbers in the n-th antidiagonal of the reciprocity array of 0. A259574

Numbers·such that there exist three integers 0<x<=y, z>0 and w>0 such that σ(x)³ = σ(y)³ = x³ + y³ + z³ + w³. A385397

a(n) = 1728·n - 24. A157287

E.g.f. satisfies: A(x) = A(x)²*(1 + x·A(x))/(1+x) - x·A'(x). A179496

Partial sums of A006010. A335648