Search a number
-
+
1988 = 22771
BaseRepresentation
bin11111000100
32201122
4133010
530423
613112
75540
oct3704
92648
101988
111548
121198
13b9c
14a20
158c8
hex7c4

1988 has 12 divisors (see below), whose sum is σ = 4032. Its totient is φ = 840.

The previous prime is 1987. The next prime is 1993. The reversal of 1988 is 8891.

Subtracting 1988 from its reverse (8891), we obtain a triangular number (6903 = T117).

It can be divided in two parts, 1 and 988, that added together give a palindrome (989).

1988 is nontrivially palindromic in base 15.

1988 is an admirable number.

1988 is an undulating number in base 15.

It is a nialpdrome in base 7 and base 14.

It is not an unprimeable number, because it can be changed into a prime (1987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8 + ... + 63.

It is an arithmetic number, because the mean of its divisors is an integer number (336).

It is an amenable number.

1988 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2016).

1988 is a wasteful number, since it uses less digits than its factorization.

1988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82 (or 80 counting only the distinct ones).

The product of its digits is 576, while the sum is 26.

The square root of 1988 is about 44.5869936192. The cubic root of 1988 is about 12.5739615124.

The spelling of 1988 in words is "one thousand, nine hundred eighty-eight".

Divisors: 1 2 4 7 14 28 71 142 284 497 994 1988