138696388 has 6 divisors (see below), whose sum is σ = 242718686. Its totient is φ = 69348192.

The previous prime is 138696379. The next prime is 138696391. The reversal of 138696388 is 883696831.

It can be written as a sum of positive squares in only one way, i.e., 135303424 + 3392964 = 11632^2 + 1842^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17337045 + ... + 17337052.

Almost surely, 2^138696388 is an apocalyptic number.

It is an amenable number.

138696388 is a deficient number, since it is larger than the sum of its proper divisors (104022298).

138696388 is a wasteful number, since it uses less digits than its factorization.

138696388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34674101 (or 34674099 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 52.

The square root of 138696388 is about 11776.9430668574. The cubic root of 138696388 is about 517.6327156950.

The spelling of 138696388 in words is "one hundred thirty-eight million, six hundred ninety-six thousand, three hundred eighty-eight".