138733884 has 60 divisors (see below), whose sum is σ = 378466704. Its totient is φ = 44231616.

The previous prime is 138733853. The next prime is 138733891. The reversal of 138733884 is 488337831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1857 + ... + 16760.

Almost surely, 2^138733884 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138733884, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (189233352).

138733884 is an abundant number, since it is smaller than the sum of its proper divisors (239732820).

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

138733884 is a wasteful number, since it uses less digits than its factorization.

138733884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18656 (or 18645 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 138733884 is about 11778.5348834225. The cubic root of 138733884 is about 517.6793581197.

The spelling of 138733884 in words is "one hundred thirty-eight million, seven hundred thirty-three thousand, eight hundred eighty-four".