138838975 has 24 divisors (see below), whose sum is σ = 188528112. Its totient is φ = 100588800.

The previous prime is 138838969. The next prime is 138838981. The reversal of 138838975 is 579838831.

138838975 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (138838969) and next prime (138838981).

It is not a de Polignac number, because 138838975 - 2⁹ = 138838463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 85269 + ... + 86881.

It is an arithmetic number, because the mean of its divisors is an integer number (7855338).

Almost surely, 2^138838975 is an apocalyptic number.

138838975 is a deficient number, since it is larger than the sum of its proper divisors (49689137).

138838975 is a wasteful number, since it uses less digits than its factorization.

138838975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1947 (or 1942 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 52.

The square root of 138838975 is about 11782.9951625213. The cubic root of 138838975 is about 517.8100392692.

The spelling of 138838975 in words is "one hundred thirty-eight million, eight hundred thirty-eight thousand, nine hundred seventy-five".