138537688 has 32 divisors (see below), whose sum is σ = 268122960. Its totient is φ = 67064320.

The previous prime is 138537677. The next prime is 138537703. The reversal of 138537688 is 886735831.

It is a congruent number.

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, 43395 + ... + 46477.

Almost surely, 2^138537688 is an apocalyptic number.

It is an amenable number.

138537688 is a deficient number, since it is larger than the sum of its proper divisors (129585272).

138537688 is a wasteful number, since it uses less digits than its factorization.

138537688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3267 (or 3263 counting only the distinct ones).

The product of its digits is 967680, while the sum is 49.

The square root of 138537688 is about 11770.2033967132. The cubic root of 138537688 is about 517.4352107583.

The spelling of 138537688 in words is "one hundred thirty-eight million, five hundred thirty-seven thousand, six hundred eighty-eight".