989858988 has 48 divisors (see below), whose sum is σ = 2568384000. Its totient is φ = 329685264.

The previous prime is 989858971. The next prime is 989858999. The reversal of 989858988 is 889858989.

It is a super-2 number, since 2×989858988² = 1959641632248768288, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 165433 + ... + 171311.

It is an arithmetic number, because the mean of its divisors is an integer number (53508000).

Almost surely, 2^989858988 is an apocalyptic number.

It is an amenable number.

989858988 is an abundant number, since it is smaller than the sum of its proper divisors (1578525012).

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

989858988 is a wasteful number, since it uses less digits than its factorization.

989858988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7451 (or 7443 counting only the distinct ones).

The product of its digits is 119439360, while the sum is 72.

The square root of 989858988 is about 31462.0245375278. The cubic root of 989858988 is about 996.6081711710.

Subtracting from 989858988 its reverse (889858989), we obtain a palindrome (99999999).

It can be divided in two parts, 9898 and 58988, that added together give a palindrome (68886).

The spelling of 989858988 in words is "nine hundred eighty-nine million, eight hundred fifty-eight thousand, nine hundred eighty-eight".