Properties of the Number -1278

Two Hundred Seventy-Eight

Basics

Value: -1279 → -1278 → -1277

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 × 3 ² × 71

Divisors: 1, 2, 3, 6, 9, 18, 71, 142, 213, 426

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -10011111110

Octal: -2376

Duodecimal: -8A6

Hexadecimal: -4fe

Square: 1633284

Square Root: 35.749125863438955

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

Triangle read by rows, inverse Bell transform of Bell numbers. A264429

Reversion of Euler totient function A000010. A50391

Dirichlet g.f.: ∏_k>=2 1 / (1 + k^-s)⁹. A339735

Average of twin prime pairs. A14574

Narayana's cows sequence: a(0) = a(1) = a(2) = 1; thereafter a(n) = a(n-1) + a(n-3). A930

a(n) = n*(4·n-1). A33991

Bisection of A000930. A2478

a(n) = a(n-1) + a(n-3) for n >= 3, with a(0) = 1, a(1) = a(2) = 0. This recurrence can also be used to define a(n) for n < 0. A78012

Even triangular numbers halved. A74378

Numbers whose negated unsorted prime signature is not unimodal. A332642