138395128 has 16 divisors (see below), whose sum is σ = 259687080. Its totient is φ = 69145248.

The previous prime is 138395099. The next prime is 138395177. The reversal of 138395128 is 821593831.

It is a super-2 number, since 2×138395128² = 38306422908272768, which contains 22 as substring.

It is a congruent number.

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, 6151 + ... + 17737.

Almost surely, 2^138395128 is an apocalyptic number.

It is an amenable number.

138395128 is a deficient number, since it is larger than the sum of its proper divisors (121291952).

138395128 is a wasteful number, since it uses less digits than its factorization.

138395128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13086 (or 13082 counting only the distinct ones).

The product of its digits is 51840, while the sum is 40.

The square root of 138395128 is about 11764.1458678478. The cubic root of 138395128 is about 517.2576636912.

The spelling of 138395128 in words is "one hundred thirty-eight million, three hundred ninety-five thousand, one hundred twenty-eight".