138276428 has 12 divisors (see below), whose sum is σ = 242180232. Its totient is φ = 69082080.

The previous prime is 138276427. The next prime is 138276431. The reversal of 138276428 is 824672831.

It is not an unprimeable number, because it can be changed into a prime (138276427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8225 + ... + 18552.

It is an arithmetic number, because the mean of its divisors is an integer number (20181686).

Almost surely, 2^138276428 is an apocalyptic number.

It is an amenable number.

138276428 is a deficient number, since it is larger than the sum of its proper divisors (103903804).

138276428 is a wasteful number, since it uses less digits than its factorization.

138276428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28072 (or 28070 counting only the distinct ones).

The product of its digits is 129024, while the sum is 41.

The square root of 138276428 is about 11759.0997954775. The cubic root of 138276428 is about 517.1097392965.

The spelling of 138276428 in words is "one hundred thirty-eight million, two hundred seventy-six thousand, four hundred twenty-eight".