138838312 has 32 divisors (see below), whose sum is σ = 270180000. Its totient is φ = 66806208.

The previous prime is 138838291. The next prime is 138838321. The reversal of 138838312 is 213838831.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87139 + ... + 88717.

It is an arithmetic number, because the mean of its divisors is an integer number (8443125).

Almost surely, 2^138838312 is an apocalyptic number.

It is an amenable number.

138838312 is a deficient number, since it is larger than the sum of its proper divisors (131341688).

138838312 is a wasteful number, since it uses less digits than its factorization.

138838312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1993 (or 1989 counting only the distinct ones).

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

The square root of 138838312 is about 11782.9670287241. The cubic root of 138838312 is about 517.8092150324.

The spelling of 138838312 in words is "one hundred thirty-eight million, eight hundred thirty-eight thousand, three hundred twelve".