138289685 has 16 divisors (see below), whose sum is σ = 173771136. Its totient is φ = 105450048.

The previous prime is 138289663. The next prime is 138289691. The reversal of 138289685 is 586982831.

It is a cyclic number.

It is not a de Polignac number, because 138289685 - 2⁶ = 138289621 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 33347 + ... + 37263.

It is an arithmetic number, because the mean of its divisors is an integer number (10860696).

Almost surely, 2^138289685 is an apocalyptic number.

It is an amenable number.

138289685 is a deficient number, since it is larger than the sum of its proper divisors (35481451).

138289685 is a wasteful number, since it uses less digits than its factorization.

138289685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4252.

The product of its digits is 829440, while the sum is 50.

The square root of 138289685 is about 11759.6634730761. The cubic root of 138289685 is about 517.1262644190.

The spelling of 138289685 in words is "one hundred thirty-eight million, two hundred eighty-nine thousand, six hundred eighty-five".