Properties of the Number -2278

Two Hundred Seventy-Eight

Basics

Value: -2279 → -2278 → -2277

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 2 × 17 × 67

Divisors: 1, 2, 17, 34, 67, 134, 1139, 2278

Polygonal

Triangular: Yes

Square: No

Pentagonal: No

Hexagonal: Yes

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -100011100110

Octal: -4346

Duodecimal: -139A

Hexadecimal: -8e6

Square: 5189284

Square Root: 47.7283982551269

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

L.g.f.: log( ∑_k>=0 x^k³ ). A363783

Coefficient array of orthogonal polynomials P(n,x)=(x-2n)*P(n-1,x)-(2n-3)*P(n-2,x), P(0,x)=1,P(1,x)=x-2. A178120

Hexagonal numbers: a(n) = n*(2·n-1). A384

Centered 9-gonal (also known as nonagonal or enneagonal) numbers. Every third triangular number, starting with a(1)=1. A60544

Triangular numbers (A000217) with prime indices. A34953

Coordination sequence for "tea" 3D uniform tiling. A299285

Numbers k such that k²⁵⁶ + 1 is prime. A56995

Generalized 17-gonal (or heptadecagonal) numbers: m*(15·m - 13)/2 with m = 0, +1, -1, +2, -2, +3, -3, ... A303305

a(n) = 2·n*(4·n - 1). A14635

Expansion of 1 / f(-x¹, -x⁵) in powers of·where f() is Ramanujan's two-variable θ function. A195848