138903888 has 20 divisors (see below), whose sum is σ = 358835168. Its totient is φ = 46301280.

The previous prime is 138903887. The next prime is 138903899. The reversal of 138903888 is 888309831.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 2893831 = 138903888 / (1 + 3 + 8 + 9 + 0 + 3 + 8 + 8 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138903887) 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, 1446868 + ... + 1446963.

Almost surely, 2^138903888 is an apocalyptic number.

It is an amenable number.

138903888 is an abundant number, since it is smaller than the sum of its proper divisors (219931280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138903888 is a wasteful number, since it uses less digits than its factorization.

138903888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2893842 (or 2893836 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 48.

The square root of 138903888 is about 11785.7493609868. The cubic root of 138903888 is about 517.8907259448.

The spelling of 138903888 in words is "one hundred thirty-eight million, nine hundred three thousand, eight hundred eighty-eight".