Properties of the Number -1678

Six Hundred Seventy-Eight

Basics

Value: -1679 → -1678 → -1677

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 2 × 839

Divisors: 1, 2, 839, 1678

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: -11010001110

Octal: -3216

Duodecimal: -B7A

Hexadecimal: -68e

Square: 2815684

Square Root: 40.963398296528084

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

a(n) = -2·n² + 12·n - 14. A147973

Expansion of ∏_k>=1 1/(1+2·x^k). A71109

Numerator of Hermite(n, 1/29). A160224

Expansion of the unique normalized cusp form of Gamma₀(5) of weight 6 in powers of q. A226347

L.g.f.: log(∏_k>=1 (1 + k·x^k)) = ∑_n>=1 a(n)*xⁿ/n. A300786

T(n,m) = number of 0..m-1 integer arrays v[1..n] of length n with all autocorrelation values sum(i){v[i]*v[i-k]} distinct for k in 0..n-1. A171307

Numbers n such that n³² + 1 is prime. A6315

Number of strict integer partitions of n with no adjacent parts having quotient >= 2. A342097

a(n) = n² - 3. A28872

Number of separable integer partitions of n without an alternating permutation. A345166