Properties of the Number -7840

Eight Hundred Forty

Basics

Value: -7841 → -7840 → -7839

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 2 ⁵ × 5 × 7 ²

Divisors: 1, 2, 4, 5, 7, 8, 10, 14, 16, 20

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -1111010100000

Octal: -17240

Duodecimal: -4654

Hexadecimal: -1ea0

Square: 61465600

Square Root: 88.54377448471462

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

Coefficient table of numerator polynomials of o.g.f.s for partial sums of powers of positive integers. A196837

Triangle interpolating between (-1)ⁿ (A033999) and the swinging factorial function (A056040) restricted to odd indices (2n+1)$ (A002457), read by rows. A163945

4-dimensional figurate numbers: a(n) = n·binomial(n+2, 3). A2417

Numbers k such that k divides 1 plus the sum of the first k primes. A128165

12-gonal (or dodecagonal) numbers: a(n) = n*(5·n-4). A51624

Numbers that are the sum of 3 positive 5th powers. A3348

a(n) = 10·n². A33583

Expansion of k/(4·q^1/2) in powers of q, where k defined by sqrt(k) = theta₂(0, q)/theta₃(0, q). A1938

Expansion of q^-1/2 * (η(q⁴) / η(q))⁴ in powers of q. A93160

Shortest edge c of (measured by the longest edge) primitive Euler bricks (a, b, c, sqrt(a² + b²), sqrt(b² + c²), sqrt(a² + c²) are integers). A31175