Properties of the Number -1988

Nine Hundred Eighty-Eight

Basics

Value: -1989 → -1988 → -1987

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 2 ² × 7 × 71

Divisors: 1, 2, 4, 7, 14, 28, 71, 142, 284, 497

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -11111000100

Octal: -3704

Duodecimal: -1198

Hexadecimal: -7c4

Square: 3952144

Square Root: 44.58699361921591

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) = ∑_d∣n (-1)^d-1*d³. A138503

a(n) = n - A243071(n). A364288

Coefficients in the expansion of B⁷/C, in Watson's notation of page 118. A160534

a(n) = A000730(7·n). A282941

a(n) = n - A332215(n). A364253

Expansion of e.g.f. ∏_k>=1 1/(1 - log(1 + x)^k/k!). A306039

Sum of the first n primes. A7504

The "comma sequence": the lexicographically earliest sequence of positive numbers with the property that the sequence formed by the pairs of digits adjacent to the commas between the terms is the same as the sequence of successive differences between the terms. A121805

Number of partitions of n into nonprime parts. A2095

Numbers n such that Bernoulli number B_n has denominator 870. A272185