138344644 has 9 divisors (see below), whose sum is σ = 242144301. Its totient is φ = 69160560.

The previous prime is 138344639. The next prime is 138344669. The reversal of 138344644 is 446443831.

The square root of 138344644 is 11762.

It is a perfect power (a square), and thus also a powerful number.

138344644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 115304644 + 23040000 = 10738^2 + 4800^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 20584 + ... + 26464.

Almost surely, 2^138344644 is an apocalyptic number.

138344644 is the 11762-nd square number.

It is an amenable number.

138344644 is a deficient number, since it is larger than the sum of its proper divisors (103799657).

138344644 is an frugal number, since it uses more digits than its factorization.

138344644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11766 (or 5883 counting only the distinct ones).

The product of its digits is 110592, while the sum is 37.

The cubic root of 138344644 is about 517.1947606779.

The spelling of 138344644 in words is "one hundred thirty-eight million, three hundred forty-four thousand, six hundred forty-four".