138804128 has 24 divisors (see below), whose sum is σ = 274861188. Its totient is φ = 68998144.

The previous prime is 138804109. The next prime is 138804151. The reversal of 138804128 is 821408831.

138804128 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 133911184 + 4892944 = 11572^2 + 2212^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7001 + ... + 18072.

Almost surely, 2^138804128 is an apocalyptic number.

It is an amenable number.

138804128 is a deficient number, since it is larger than the sum of its proper divisors (136057060).

138804128 is a wasteful number, since it uses less digits than its factorization.

138804128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25256 (or 25248 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 35.

The square root of 138804128 is about 11781.5163709940. The cubic root of 138804128 is about 517.7667141720.

The spelling of 138804128 in words is "one hundred thirty-eight million, eight hundred four thousand, one hundred twenty-eight".