138928893 has 32 divisors (see below), whose sum is σ = 200640000. Its totient is φ = 85240512.

The previous prime is 138928891. The next prime is 138928939. The reversal of 138928893 is 398829831.

It is not a de Polignac number, because 138928893 - 2¹ = 138928891 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 366378 + ... + 366756.

It is an arithmetic number, because the mean of its divisors is an integer number (6270000).

Almost surely, 2^138928893 is an apocalyptic number.

It is an amenable number.

138928893 is a deficient number, since it is larger than the sum of its proper divisors (61711107).

138928893 is a wasteful number, since it uses less digits than its factorization.

138928893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569.

The product of its digits is 746496, while the sum is 51.

The square root of 138928893 is about 11786.8101282747. The cubic root of 138928893 is about 517.9218003825.

The spelling of 138928893 in words is "one hundred thirty-eight million, nine hundred twenty-eight thousand, eight hundred ninety-three".