138400943793 has 12 divisors (see below), whose sum is σ = 214662688560. Its totient is φ = 79086253512.

The previous prime is 138400943789. The next prime is 138400943801. The reversal of 138400943793 is 397349004831.

It is not a de Polignac number, because 138400943793 - 2² = 138400943789 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138400943393) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 470751363 + ... + 470751656.

It is an arithmetic number, because the mean of its divisors is an integer number (17888557380).

Almost surely, 2^138400943793 is an apocalyptic number.

It is an amenable number.

138400943793 is a deficient number, since it is larger than the sum of its proper divisors (76261744767).

138400943793 is an equidigital number, since it uses as much as digits as its factorization.

138400943793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 941503036 (or 941503029 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 51.

The spelling of 138400943793 in words is "one hundred thirty-eight billion, four hundred million, nine hundred forty-three thousand, seven hundred ninety-three".