999838998 has 16 divisors (see below), whose sum is σ = 2221864560. Its totient is φ = 333279648.

The previous prime is 999838963. The next prime is 999839017. The reversal of 999838998 is 899838999.

999838998 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 9257715 + ... + 9257822.

It is an arithmetic number, because the mean of its divisors is an integer number (138866535).

Almost surely, 2^999838998 is an apocalyptic number.

999838998 is an abundant number, since it is smaller than the sum of its proper divisors (1222025562).

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

999838998 is a wasteful number, since it uses less digits than its factorization.

999838998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18515548 (or 18515542 counting only the distinct ones).

The product of its digits is 90699264, while the sum is 72.

The square root of 999838998 is about 31620.2308340720. The cubic root of 999838998 is about 999.9463297862.

Subtracting from 999838998 its reverse (899838999), we obtain a palindrome (99999999).

The spelling of 999838998 in words is "nine hundred ninety-nine million, eight hundred thirty-eight thousand, nine hundred ninety-eight".