399204534138 has 8 divisors (see below), whose sum is σ = 798409068288. Its totient is φ = 133068178044.

The previous prime is 399204534103. The next prime is 399204534163. The reversal of 399204534138 is 831435402993.

It is a sphenic number, since it is the product of 3 distinct primes.

399204534138 is an admirable number.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33267044506 + ... + 33267044517.

It is an arithmetic number, because the mean of its divisors is an integer number (99801133536).

Almost surely, 2^399204534138 is an apocalyptic number.

399204534138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

399204534138 is a wasteful number, since it uses less digits than its factorization.

399204534138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66534089028.

The product of its (nonzero) digits is 2799360, while the sum is 51.

The spelling of 399204534138 in words is "three hundred ninety-nine billion, two hundred four million, five hundred thirty-four thousand, one hundred thirty-eight".