Properties of the Number -1978

Nine Hundred Seventy-Eight

Basics

Value: -1979 → -1978 → -1977

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 2 × 23 × 43

Divisors: 1, 2, 23, 43, 46, 86, 989, 1978

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -11110111010

Octal: -3672

Duodecimal: -118A

Hexadecimal: -7ba

Square: 3912484

Square Root: 44.474711915874174

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

n times the coefficient of xⁿ in log[1 + sum(k>=0, x²^k)]. A92462

a(n) = n*(n+3). A28552

Number of partitions of n such that no part is a sum of two other parts. A236912

Coordination sequence for "reo-e" 3D uniform tiling. A299281

Number of aperiodic compositions of n with relatively prime parts. Number of compositions of n with relatively prime parts and relatively prime run-lengths. A296302

MM-numbers of nesting multiset partitions. A326256

a(n) = ∑_k=0..n-3 T(n,k) * T(n,k+3), with T given by A026626. A26964

Number of integer partitions of n with as many even parts as odd parts and as many even conjugate parts as odd conjugate parts. A351977

a(n) = φ(n) * A064989(n), where φ is Euler totient function, and A064989 shifts the prime factorization one step towards lower primes. A353749

Numbers k such that for any positive integers (a, b), if a·b = k then a + b is prime. A80715