989393988 has 24 divisors (see below), whose sum is σ = 2518457760. Its totient is φ = 299816320.

The previous prime is 989393917. The next prime is 989393989. The reversal of 989393988 is 889393989.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is not an unprimeable number, because it can be changed into a prime (989393989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3747573 + ... + 3747836.

It is an arithmetic number, because the mean of its divisors is an integer number (104935740).

Almost surely, 2^989393988 is an apocalyptic number.

It is an amenable number.

989393988 is an abundant number, since it is smaller than the sum of its proper divisors (1529063772).

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

989393988 is a wasteful number, since it uses less digits than its factorization.

989393988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7495427 (or 7495425 counting only the distinct ones).

The product of its digits is 30233088, while the sum is 66.

The square root of 989393988 is about 31454.6338080735. The cubic root of 989393988 is about 996.4520898871.

Subtracting from 989393988 its reverse (889393989), we obtain a palindrome (99999999).

The spelling of 989393988 in words is "nine hundred eighty-nine million, three hundred ninety-three thousand, nine hundred eighty-eight".