999099904 has 60 divisors (see below), whose sum is σ = 2194359552. Its totient is φ = 454108160.

The previous prime is 999099901. The next prime is 999099919. The reversal of 999099904 is 409990999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999099901) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53889 + ... + 70015.

Almost surely, 2^999099904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999099904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1097179776).

999099904 is an abundant number, since it is smaller than the sum of its proper divisors (1195259648).

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

999099904 is a wasteful number, since it uses less digits than its factorization.

999099904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16167 (or 16140 counting only the distinct ones).

The product of its (nonzero) digits is 2125764, while the sum is 58.

The square root of 999099904 is about 31608.5416303885. The cubic root of 999099904 is about 999.6998779358.

The spelling of 999099904 in words is "nine hundred ninety-nine million, ninety-nine thousand, nine hundred four".