138643724 has 12 divisors (see below), whose sum is σ = 253175664. Its totient is φ = 66307824.

The previous prime is 138643711. The next prime is 138643733. The reversal of 138643724 is 427346831.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 753407 + ... + 753590.

It is an arithmetic number, because the mean of its divisors is an integer number (21097972).

Almost surely, 2^138643724 is an apocalyptic number.

It is an amenable number.

138643724 is a deficient number, since it is larger than the sum of its proper divisors (114531940).

138643724 is a wasteful number, since it uses less digits than its factorization.

138643724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1507024 (or 1507022 counting only the distinct ones).

The product of its digits is 96768, while the sum is 38.

The square root of 138643724 is about 11774.7069602602. The cubic root of 138643724 is about 517.5671911325.

The spelling of 138643724 in words is "one hundred thirty-eight million, six hundred forty-three thousand, seven hundred twenty-four".