138439716 has 12 divisors (see below), whose sum is σ = 323026032. Its totient is φ = 46146568.

The previous prime is 138439711. The next prime is 138439729. The reversal of 138439716 is 617934831.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (138439711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5768310 + ... + 5768333.

It is an arithmetic number, because the mean of its divisors is an integer number (26918836).

Almost surely, 2^138439716 is an apocalyptic number.

It is an amenable number.

138439716 is an abundant number, since it is smaller than the sum of its proper divisors (184586316).

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

138439716 is a wasteful number, since it uses less digits than its factorization.

138439716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11536650 (or 11536648 counting only the distinct ones).

The product of its digits is 108864, while the sum is 42.

The square root of 138439716 is about 11766.0407954418. The cubic root of 138439716 is about 517.3132075740.

The spelling of 138439716 in words is "one hundred thirty-eight million, four hundred thirty-nine thousand, seven hundred sixteen".