Properties of the Number -1786

Seven Hundred Eighty-Six

Basics

Value: -1787 → -1786 → -1785

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 2 × 19 × 47

Divisors: 1, 2, 19, 38, 47, 94, 893, 1786

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -11011111010

Octal: -3372

Duodecimal: -104A

Hexadecimal: -6fa

Square: 3189796

Square Root: 42.261093218230876

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. satisfies: A(x) = (1 - x) * ∏_k>0 A(x^2·k) / ∏_k>1 A(x^2·k-1). A321326

Expansion of (1-x)*(2·x²+2·x+1) / ((x²-x-1)*(x²+x+1)). A111734

Array: row n shows the coefficients of the characteristic polynomial of the n-th principal submatrix of f(i,j)=(i if i=j and 1 otherwise) (A204125). A204128

a(n) = ∑_d∣n μ(d) * binomial(d+n/d-1, d). A338657

Centered triangular numbers: a(n) = 3·n*(n-1)/2 + 1. A5448

Numbers that are the sum of 6 positive 5th powers. A3351

a(n) = 4·n² - 7·n + 4. A54567

Numbers k such that k¹²⁸ + 1 is prime. A56994

Number of twice-partitions of n into distinct strict partitions. A358914

One of many square spiral sequences: a(n) = n² + n - floor((n-1)/2). A317186