138696928 has 12 divisors (see below), whose sum is σ = 273059640. Its totient is φ = 69348448.

The previous prime is 138696911. The next prime is 138696959. The reversal of 138696928 is 829696831.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2167108 + ... + 2167171.

It is an arithmetic number, because the mean of its divisors is an integer number (22754970).

Almost surely, 2^138696928 is an apocalyptic number.

It is an amenable number.

138696928 is a deficient number, since it is larger than the sum of its proper divisors (134362712).

138696928 is an equidigital number, since it uses as much as digits as its factorization.

138696928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4334289 (or 4334281 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 52.

The square root of 138696928 is about 11776.9659929882. The cubic root of 138696928 is about 517.6333874772.

The spelling of 138696928 in words is "one hundred thirty-eight million, six hundred ninety-six thousand, nine hundred twenty-eight".