Properties of the Number 1278

One Thousand Two Hundred Seventy-Eight

Basics

Value: 1277 → 1278 → 1279

Parity: even

Prime: No

Previous Prime: 1277

Next Prime: 1279

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

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

Numbers k such that 2^k+1 - 1 is prime. A90748

The main column of a version of the square spiral. A156859

Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n), where a(0) = 1, a(1) = 3, b(0) = 2, b(1) = 4, b(2) = 5, and (a(n)) and (b(n)) are increasing complementary sequences. A295862