391375138 has 32 divisors (see below), whose sum is σ = 737722368. Its totient is φ = 151275600.

The previous prime is 391375123. The next prime is 391375183. The reversal of 391375138 is 831573193.

It is a self number, because there is not a number n which added to its sum of digits gives 391375138.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9553 + ... + 29563.

It is an arithmetic number, because the mean of its divisors is an integer number (23053824).

Almost surely, 2^391375138 is an apocalyptic number.

391375138 is a deficient number, since it is larger than the sum of its proper divisors (346347230).

391375138 is a wasteful number, since it uses less digits than its factorization.

391375138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20158.

The product of its digits is 68040, while the sum is 40.

The square root of 391375138 is about 19783.2034311938. The cubic root of 391375138 is about 731.4720642639.

The spelling of 391375138 in words is "three hundred ninety-one million, three hundred seventy-five thousand, one hundred thirty-eight".