989919990 has 48 divisors (see below), whose sum is σ = 2636577216. Its totient is φ = 257539200.

The previous prime is 989919989. The next prime is 989920021. The reversal of 989919990 is 99919989.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 130446 + ... + 137825.

It is an arithmetic number, because the mean of its divisors is an integer number (54928692).

Almost surely, 2^989919990 is an apocalyptic number.

989919990 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

989919990 is an abundant number, since it is smaller than the sum of its proper divisors (1646657226).

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

989919990 is a wasteful number, since it uses less digits than its factorization.

989919990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268325 (or 268322 counting only the distinct ones).

The product of its (nonzero) digits is 4251528, while the sum is 63.

The square root of 989919990 is about 31462.9939770518. The cubic root of 989919990 is about 996.6286433943.

The spelling of 989919990 in words is "nine hundred eighty-nine million, nine hundred nineteen thousand, nine hundred ninety".