989898990 has 16 divisors (see below), whose sum is σ = 2375757648. Its totient is φ = 263973056.

The previous prime is 989898989. The next prime is 989898997. The reversal of 989898990 is 99898989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989898997) 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, 16498287 + ... + 16498346.

It is an arithmetic number, because the mean of its divisors is an integer number (148484853).

Almost surely, 2^989898990 is an apocalyptic number.

989898990 is an abundant number, since it is smaller than the sum of its proper divisors (1385858658).

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

989898990 is a wasteful number, since it uses less digits than its factorization.

989898990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32996643.

The product of its (nonzero) digits is 30233088, while the sum is 69.

The square root of 989898990 is about 31462.6602498899. The cubic root of 989898990 is about 996.6215959057.

The spelling of 989898990 in words is "nine hundred eighty-nine million, eight hundred ninety-eight thousand, nine hundred ninety".