989818990 has 32 divisors (see below), whose sum is σ = 1837243296. Its totient is φ = 383760000.

The previous prime is 989818957. The next prime is 989818997. The reversal of 989818990 is 99818989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989818997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32740 + ... + 55240.

It is an arithmetic number, because the mean of its divisors is an integer number (57413853).

Almost surely, 2^989818990 is an apocalyptic number.

989818990 is a deficient number, since it is larger than the sum of its proper divisors (847424306).

989818990 is a wasteful number, since it uses less digits than its factorization.

989818990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22644.

The product of its (nonzero) digits is 3359232, while the sum is 61.

The square root of 989818990 is about 31461.3888758904. The cubic root of 989818990 is about 996.5947474170.

The spelling of 989818990 in words is "nine hundred eighty-nine million, eight hundred eighteen thousand, nine hundred ninety".