989858990 has 16 divisors (see below), whose sum is σ = 1782112752. Its totient is φ = 395862144.

The previous prime is 989858971. The next prime is 989858999. The reversal of 989858990 is 99858989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989858999) 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, 73997 + ... + 86343.

It is an arithmetic number, because the mean of its divisors is an integer number (111382047).

Almost surely, 2^989858990 is an apocalyptic number.

989858990 is a deficient number, since it is larger than the sum of its proper divisors (792253762).

989858990 is a wasteful number, since it uses less digits than its factorization.

989858990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20371.

The product of its (nonzero) digits is 16796160, while the sum is 65.

The square root of 989858990 is about 31462.0245693121. The cubic root of 989858990 is about 996.6081718422.

The spelling of 989858990 in words is "nine hundred eighty-nine million, eight hundred fifty-eight thousand, nine hundred ninety".