138854728 has 16 divisors (see below), whose sum is σ = 260509500. Its totient is φ = 69385536.

The previous prime is 138854711. The next prime is 138854791. The reversal of 138854728 is 827458831.

138854728 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 138815524 + 39204 = 11782^2 + 198^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12358 + ... + 20746.

Almost surely, 2^138854728 is an apocalyptic number.

It is an amenable number.

138854728 is a deficient number, since it is larger than the sum of its proper divisors (121654772).

138854728 is a wasteful number, since it uses less digits than its factorization.

138854728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10464 (or 10460 counting only the distinct ones).

The product of its digits is 430080, while the sum is 46.

The square root of 138854728 is about 11783.6636068754. The cubic root of 138854728 is about 517.8296225144.

The spelling of 138854728 in words is "one hundred thirty-eight million, eight hundred fifty-four thousand, seven hundred twenty-eight".