999939198 has 64 divisors (see below), whose sum is σ = 2117664000. Its totient is φ = 314302464.

The previous prime is 999939137. The next prime is 999939203. The reversal of 999939198 is 891939999.

Its product of digits (12754584) is a multiple of the sum of its prime divisors (729).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2638173 + ... + 2638551.

It is an arithmetic number, because the mean of its divisors is an integer number (33088500).

Almost surely, 2^999939198 is an apocalyptic number.

999939198 is an abundant number, since it is smaller than the sum of its proper divisors (1117724802).

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

999939198 is a wasteful number, since it uses less digits than its factorization.

999939198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729.

The product of its digits is 12754584, while the sum is 66.

The square root of 999939198 is about 31621.8152230387. The cubic root of 999939198 is about 999.9797322559.

The spelling of 999939198 in words is "nine hundred ninety-nine million, nine hundred thirty-nine thousand, one hundred ninety-eight".