990109798 has 16 divisors (see below), whose sum is σ = 1589832000. Its totient is φ = 461049192.

The previous prime is 990109789. The next prime is 990109831. The reversal of 990109798 is 897901099.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 218568 + ... + 223051.

It is an arithmetic number, because the mean of its divisors is an integer number (99364500).

Almost surely, 2^990109798 is an apocalyptic number.

990109798 is a deficient number, since it is larger than the sum of its proper divisors (599722202).

990109798 is a wasteful number, since it uses less digits than its factorization.

990109798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441699.

The product of its (nonzero) digits is 367416, while the sum is 52.

The square root of 990109798 is about 31466.0102014857. The cubic root of 990109798 is about 996.6923374310.

The spelling of 990109798 in words is "nine hundred ninety million, one hundred nine thousand, seven hundred ninety-eight".