999803904 has 88 divisors (see below), whose sum is σ = 2907198528. Its totient is φ = 302960640.

The previous prime is 999803887. The next prime is 999803941. The reversal of 999803904 is 409308999.

It is a tau number, because it is divible by the number of its divisors (88).

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, 18999 + ... + 48585.

Almost surely, 2^999803904 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 999803904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1453599264).

999803904 is an abundant number, since it is smaller than the sum of its proper divisors (1907394624).

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

999803904 is a wasteful number, since it uses less digits than its factorization.

999803904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29621 (or 29603 counting only the distinct ones).

The product of its (nonzero) digits is 629856, while the sum is 51.

The square root of 999803904 is about 31619.6758996673. The cubic root of 999803904 is about 999.9346303936.

The spelling of 999803904 in words is "nine hundred ninety-nine million, eight hundred three thousand, nine hundred four".