138805288938 has 24 divisors (see below), whose sum is σ = 300876383808. Its totient is φ = 46248184872.

The previous prime is 138805288901. The next prime is 138805288961. The reversal of 138805288938 is 839882508831.

138805288938 is a `hidden beast` number, since 13 + 8 + 8 + 0 + 528 + 8 + 93 + 8 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1644756 + ... + 1727087.

It is an arithmetic number, because the mean of its divisors is an integer number (12536515992).

Almost surely, 2^138805288938 is an apocalyptic number.

138805288938 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

138805288938 is an abundant number, since it is smaller than the sum of its proper divisors (162071094870).

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

138805288938 is a wasteful number, since it uses less digits than its factorization.

138805288938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3374138 (or 3374135 counting only the distinct ones).

The product of its (nonzero) digits is 26542080, while the sum is 63.

The spelling of 138805288938 in words is "one hundred thirty-eight billion, eight hundred five million, two hundred eighty-eight thousand, nine hundred thirty-eight".