989115990 has 16 divisors (see below), whose sum is σ = 2373878448. Its totient is φ = 263764256.

The previous prime is 989115979. The next prime is 989115997. The reversal of 989115990 is 99511989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989115997) 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, 16485237 + ... + 16485296.

It is an arithmetic number, because the mean of its divisors is an integer number (148367403).

Almost surely, 2^989115990 is an apocalyptic number.

989115990 is an abundant number, since it is smaller than the sum of its proper divisors (1384762458).

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

989115990 is a wasteful number, since it uses less digits than its factorization.

989115990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32970543.

The product of its (nonzero) digits is 262440, while the sum is 51.

The square root of 989115990 is about 31450.2144666773. The cubic root of 989115990 is about 996.3587540876.

The spelling of 989115990 in words is "nine hundred eighty-nine million, one hundred fifteen thousand, nine hundred ninety".