138249724 has 6 divisors (see below), whose sum is σ = 241937024. Its totient is φ = 69124860.

The previous prime is 138249707. The next prime is 138249731. The reversal of 138249724 is 427942831.

138249724 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×138249724² = 38225972372152352, which contains 22 as substring.

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, 17281212 + ... + 17281219.

Almost surely, 2^138249724 is an apocalyptic number.

It is an amenable number.

138249724 is a deficient number, since it is larger than the sum of its proper divisors (103687300).

138249724 is a wasteful number, since it uses less digits than its factorization.

138249724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34562435 (or 34562433 counting only the distinct ones).

The product of its digits is 96768, while the sum is 40.

The square root of 138249724 is about 11757.9642795851. The cubic root of 138249724 is about 517.0764490056.

The spelling of 138249724 in words is "one hundred thirty-eight million, two hundred forty-nine thousand, seven hundred twenty-four".