138400943844 has 24 divisors (see below), whose sum is σ = 323183412160. Its totient is φ = 46098237024.

The previous prime is 138400943809. The next prime is 138400943873. The reversal of 138400943844 is 448349004831.

It is a junction number, because it is equal to n+sod(n) for n = 138400943793 and 138400943802.

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, 4410079 + ... + 4441350.

Almost surely, 2^138400943844 is an apocalyptic number.

It is an amenable number.

138400943844 is an abundant number, since it is smaller than the sum of its proper divisors (184782468316).

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

138400943844 is a wasteful number, since it uses less digits than its factorization.

138400943844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8852739 (or 8852737 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 48.

The spelling of 138400943844 in words is "one hundred thirty-eight billion, four hundred million, nine hundred forty-three thousand, eight hundred forty-four".