138639147 has 16 divisors (see below), whose sum is σ = 195774720. Its totient is φ = 87085152.

The previous prime is 138639113. The next prime is 138639157. The reversal of 138639147 is 741936831.

138639147 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138639147 - 2¹⁹ = 138114859 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138639099 and 138639108.

It is not an unprimeable number, because it can be changed into a prime (138639157) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10372 + ... + 19617.

It is an arithmetic number, because the mean of its divisors is an integer number (12235920).

Almost surely, 2^138639147 is an apocalyptic number.

138639147 is a deficient number, since it is larger than the sum of its proper divisors (57135573).

138639147 is a wasteful number, since it uses less digits than its factorization.

138639147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30082.

The product of its digits is 108864, while the sum is 42.

The square root of 138639147 is about 11774.5126013776. The cubic root of 138639147 is about 517.5614956443.

The spelling of 138639147 in words is "one hundred thirty-eight million, six hundred thirty-nine thousand, one hundred forty-seven".