138888916 has 12 divisors (see below), whose sum is σ = 243298132. Its totient is φ = 69375168.

The previous prime is 138888913. The next prime is 138888931. The reversal of 138888916 is 619888831.

It can be written as a sum of positive squares in 2 ways, for example, as 91278916 + 47610000 = 9554^2 + 6900^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138888913) 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, 12675 + ... + 20938.

Almost surely, 2^138888916 is an apocalyptic number.

It is an amenable number.

138888916 is a deficient number, since it is larger than the sum of its proper divisors (104409216).

138888916 is a wasteful number, since it uses less digits than its factorization.

138888916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34650 (or 34648 counting only the distinct ones).

The product of its digits is 663552, while the sum is 52.

The square root of 138888916 is about 11785.1141700028. The cubic root of 138888916 is about 517.8721180219.

The spelling of 138888916 in words is "one hundred thirty-eight million, eight hundred eighty-eight thousand, nine hundred sixteen".