999939138 has 16 divisors (see below), whose sum is σ = 2181685536. Its totient is φ = 303011840.

The previous prime is 999939137. The next prime is 999939203. The reversal of 999939138 is 831939999.

It is not an unprimeable number, because it can be changed into a prime (999939137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7575231 + ... + 7575362.

It is an arithmetic number, because the mean of its divisors is an integer number (136355346).

Almost surely, 2^999939138 is an apocalyptic number.

999939138 is an abundant number, since it is smaller than the sum of its proper divisors (1181746398).

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

999939138 is a wasteful number, since it uses less digits than its factorization.

999939138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15150609.

The product of its digits is 4251528, while the sum is 60.

The square root of 999939138 is about 31621.8142743265. The cubic root of 999939138 is about 999.9797122551.

The spelling of 999939138 in words is "nine hundred ninety-nine million, nine hundred thirty-nine thousand, one hundred thirty-eight".