138730938 has 16 divisors (see below), whose sum is σ = 277809696. Its totient is φ = 46185680.

The previous prime is 138730919. The next prime is 138730939. The reversal of 138730938 is 839037831.

138730938 is digitally balanced in base 2, 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 138730938.

It is not an unprimeable number, because it can be changed into a prime (138730939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9156 + ... + 19007.

It is an arithmetic number, because the mean of its divisors is an integer number (17363106).

Almost surely, 2^138730938 is an apocalyptic number.

138730938 is an abundant number, since it is smaller than the sum of its proper divisors (139078758).

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

138730938 is a wasteful number, since it uses less digits than its factorization.

138730938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28989.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 138730938 is about 11778.4098247599. The cubic root of 138730938 is about 517.6756938042.

The spelling of 138730938 in words is "one hundred thirty-eight million, seven hundred thirty thousand, nine hundred thirty-eight".