138388312 has 8 divisors (see below), whose sum is σ = 259478100. Its totient is φ = 69194152.

The previous prime is 138388291. The next prime is 138388357. The reversal of 138388312 is 213883831.

138388312 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8649262 + ... + 8649277.

Almost surely, 2^138388312 is an apocalyptic number.

It is an amenable number.

138388312 is a deficient number, since it is larger than the sum of its proper divisors (121089788).

138388312 is a wasteful number, since it uses less digits than its factorization.

138388312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17298545 (or 17298541 counting only the distinct ones).

The product of its digits is 27648, while the sum is 37.

The square root of 138388312 is about 11763.8561704910. The cubic root of 138388312 is about 517.2491718554.

The spelling of 138388312 in words is "one hundred thirty-eight million, three hundred eighty-eight thousand, three hundred twelve".