138734724 has 72 divisors (see below), whose sum is σ = 342407520. Its totient is φ = 43705088.

The previous prime is 138734699. The next prime is 138734731. The reversal of 138734724 is 427437831.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 595312 + ... + 595544.

It is an arithmetic number, because the mean of its divisors is an integer number (4755660).

Almost surely, 2^138734724 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138734724, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (171203760).

138734724 is an abundant number, since it is smaller than the sum of its proper divisors (203672796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138734724 is a wasteful number, since it uses less digits than its factorization.

138734724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357 (or 326 counting only the distinct ones).

The product of its digits is 112896, while the sum is 39.

The square root of 138734724 is about 11778.5705414537. The cubic root of 138734724 is about 517.6804029252.

The spelling of 138734724 in words is "one hundred thirty-eight million, seven hundred thirty-four thousand, seven hundred twenty-four".