138275938 has 4 divisors (see below), whose sum is σ = 207413910. Its totient is φ = 69137968.

The previous prime is 138275899. The next prime is 138275957. The reversal of 138275938 is 839572831.

138275938 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 839572831 = 3863 ⋅217337.

It can be written as a sum of positive squares in only one way, i.e., 113145769 + 25130169 = 10637^2 + 5013^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34568983 + ... + 34568986.

Almost surely, 2^138275938 is an apocalyptic number.

138275938 is a deficient number, since it is larger than the sum of its proper divisors (69137972).

138275938 is an equidigital number, since it uses as much as digits as its factorization.

138275938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69137971.

The product of its digits is 362880, while the sum is 46.

The square root of 138275938 is about 11759.0789605309. The cubic root of 138275938 is about 517.1091284812.

The spelling of 138275938 in words is "one hundred thirty-eight million, two hundred seventy-five thousand, nine hundred thirty-eight".