999998904 has 16 divisors (see below), whose sum is σ = 2499997320. Its totient is φ = 333332960.

The previous prime is 999998903. The next prime is 999998917. The reversal of 999998904 is 409899999.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999998903) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 20833287 + ... + 20833334.

Almost surely, 2^999998904 is an apocalyptic number.

It is an amenable number.

999998904 is an abundant number, since it is smaller than the sum of its proper divisors (1499998416).

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

999998904 is a wasteful number, since it uses less digits than its factorization.

999998904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41666630 (or 41666626 counting only the distinct ones).

The product of its (nonzero) digits is 17006112, while the sum is 66.

The square root of 999998904 is about 31622.7592723975. The cubic root of 999998904 is about 999.9996346665. Note that the first 3 decimals are identical.

The spelling of 999998904 in words is "nine hundred ninety-nine million, nine hundred ninety-eight thousand, nine hundred four".