138939385830 has 96 divisors (see below), whose sum is σ = 387989385696. Its totient is φ = 31749935616.

The previous prime is 138939385813. The next prime is 138939385843. The reversal of 138939385830 is 38583939831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8042562 + ... + 8059818.

It is an arithmetic number, because the mean of its divisors is an integer number (4041556101).

Almost surely, 2^138939385830 is an apocalyptic number.

138939385830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138939385830 is an abundant number, since it is smaller than the sum of its proper divisors (249049999866).

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

138939385830 is a wasteful number, since it uses less digits than its factorization.

138939385830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22758 (or 22751 counting only the distinct ones).

The product of its (nonzero) digits is 16796160, while the sum is 60.

The spelling of 138939385830 in words is "one hundred thirty-eight billion, nine hundred thirty-nine million, three hundred eighty-five thousand, eight hundred thirty".