138439385 has 16 divisors (see below), whose sum is σ = 194992896. Its totient is φ = 92363328.

The previous prime is 138439333. The next prime is 138439391. The reversal of 138439385 is 583934831.

It is a cyclic number.

It is not a de Polignac number, because 138439385 - 2⁸ = 138439129 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52157 + ... + 54746.

It is an arithmetic number, because the mean of its divisors is an integer number (12187056).

Almost surely, 2^138439385 is an apocalyptic number.

It is an amenable number.

138439385 is a deficient number, since it is larger than the sum of its proper divisors (56553511).

138439385 is a wasteful number, since it uses less digits than its factorization.

138439385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106952.

The product of its digits is 311040, while the sum is 44.

The square root of 138439385 is about 11766.0267295294. The cubic root of 138439385 is about 517.3127952867.

The spelling of 138439385 in words is "one hundred thirty-eight million, four hundred thirty-nine thousand, three hundred eighty-five".