138933188 has 12 divisors (see below), whose sum is σ = 243912060. Its totient is φ = 69244032.

The previous prime is 138933181. The next prime is 138933191. The reversal of 138933188 is 881339831.

It is a happy number.

138933188 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 6959044 + 131974144 = 2638^2 + 11488^2 .

It is not an unprimeable number, because it can be changed into a prime (138933181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54233 + ... + 56736.

It is an arithmetic number, because the mean of its divisors is an integer number (20326005).

Almost surely, 2^138933188 is an apocalyptic number.

It is an amenable number.

138933188 is a deficient number, since it is larger than the sum of its proper divisors (104978872).

138933188 is a wasteful number, since it uses less digits than its factorization.

138933188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111286 (or 111284 counting only the distinct ones).

The product of its digits is 124416, while the sum is 44.

The square root of 138933188 is about 11786.9923220472. The cubic root of 138933188 is about 517.9271375281.

The spelling of 138933188 in words is "one hundred thirty-eight million, nine hundred thirty-three thousand, one hundred eighty-eight".