138928892 has 12 divisors (see below), whose sum is σ = 243214440. Its totient is φ = 69439056.

The previous prime is 138928891. The next prime is 138928939. The reversal of 138928892 is 298829831.

138928892 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 138928892.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138928891) 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, 11603 + ... + 20309.

It is an arithmetic number, because the mean of its divisors is an integer number (20267870).

Almost surely, 2^138928892 is an apocalyptic number.

It is an amenable number.

138928892 is a deficient number, since it is larger than the sum of its proper divisors (104285548).

138928892 is a wasteful number, since it uses less digits than its factorization.

138928892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12700 (or 12698 counting only the distinct ones).

The product of its digits is 497664, while the sum is 50.

The square root of 138928892 is about 11786.8100858544. The cubic root of 138928892 is about 517.9217991398.

The spelling of 138928892 in words is "one hundred thirty-eight million, nine hundred twenty-eight thousand, eight hundred ninety-two".