138409963788 has 24 divisors (see below), whose sum is σ = 334093016880. Its totient is φ = 44545735360.

The previous prime is 138409963733. The next prime is 138409963801. The reversal of 138409963788 is 887369904831.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198864543 + ... + 198865238.

It is an arithmetic number, because the mean of its divisors is an integer number (13920542370).

Almost surely, 2^138409963788 is an apocalyptic number.

It is an amenable number.

138409963788 is an abundant number, since it is smaller than the sum of its proper divisors (195683053092).

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

138409963788 is a wasteful number, since it uses less digits than its factorization.

138409963788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397729817 (or 397729815 counting only the distinct ones).

The product of its (nonzero) digits is 62705664, while the sum is 66.

The spelling of 138409963788 in words is "one hundred thirty-eight billion, four hundred nine million, nine hundred sixty-three thousand, seven hundred eighty-eight".