Properties of the Number 6990

Six Thousand Nine Hundred Ninety

Basics

Value: 6989 → 6990 → 6991

Parity: even

Prime: No

Previous Prime: 6983

Next Prime: 6991

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 2 × 3 × 5 × 233

Divisors: 1, 2, 3, 5, 6, 10, 15, 30, 233, 466

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1101101001110

Octal: 15516

Duodecimal: 4066

Hexadecimal: 1b4e

Square: 48860100

Square Root: 83.60621986431393

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

18-gonal (or octadecagonal) numbers: a(n) = n*(8·n-7). A51870

Expansion of 1/(1 - x*∏_k>=1 (1 - x^k)). A299105

a(n) = 2·n*Fibonacci(n-2) + (-1)ⁿ + 1. A309874

Integer part of the volume of a regular tetrahedron with edge length n. A171973

Expansion of ∏_k>=1 (1+x^k)^k*(k-1*(k-2)). A258345

Irregular table read by rows: T(n, k) is the coefficient of x^k in the chromatic polynomial of the 1-skeleton of the n-dimensional cross polytope, 0 <= k <= 2n. A334279

Numbers which need eight 'Reverse and Add' steps to reach a palindrome. A65213

Numbers n for which n' + n and n' - n are both prime, n' being the arithmetic derivative of n. A229272

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

Products of four distinct Fibonacci numbers > 1. A272950