138128272 has 40 divisors (see below), whose sum is σ = 273196800. Its totient is φ = 67638912.

The previous prime is 138128269. The next prime is 138128273. The reversal of 138128272 is 272821831.

It is not an unprimeable number, because it can be changed into a prime (138128273) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 288129 + ... + 288607.

It is an arithmetic number, because the mean of its divisors is an integer number (6829920).

Almost surely, 2^138128272 is an apocalyptic number.

It is an amenable number.

138128272 is a deficient number, since it is larger than the sum of its proper divisors (135068528).

138128272 is a wasteful number, since it uses less digits than its factorization.

138128272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823 (or 817 counting only the distinct ones).

The product of its digits is 10752, while the sum is 34.

The square root of 138128272 is about 11752.7984752569. The cubic root of 138128272 is about 516.9249879010.

The spelling of 138128272 in words is "one hundred thirty-eight million, one hundred twenty-eight thousand, two hundred seventy-two".