Properties of the Number -2686

Six Hundred Eighty-Six

Basics

Value: -2687 → -2686 → -2685

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 2 × 17 × 79

Divisors: 1, 2, 17, 34, 79, 158, 1343, 2686

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -101001111110

Octal: -5176

Duodecimal: -167A

Hexadecimal: -a7e

Square: 7214596

Square Root: 51.82663407939975

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

G.f. equals the logarithm of the e.g.f. of A296172. A296173

Triangle read by rows: T(n, k) is the coefficient of x^k of the polynomial p_n(x) representing the n-th diagonal of A246654. A246656

Number of integer partitions of n whose negated run-lengths are not unimodal. A332639

Numbers k such that σ(k) = σ(k+12). A15882

Main diagonal of array in A163280. A164000

Decimal part of cube root of n starts with 9: first term of runs. A34135

Numbers k with property that for every base b >= 2, there is a number m such that m+s(m) = k, where s(m) = sum of digits in the base-b expansion of m. A230624

Number of positive solutions to x²+y²+z² <= n². A253663

a(1)=1; thereafter, a(n) is the smallest number such that both the addition and multiplication tables for (a(1),...,a(n)) contain n*(n+1)/2 different entries (the maximum possible). A337655

Numbers k such that σ(k) = σ(k-1). A231546