138703517938 has 4 divisors (see below), whose sum is σ = 208055276910. Its totient is φ = 69351758968.

The previous prime is 138703517933. The next prime is 138703517959. The reversal of 138703517938 is 839715307831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 839715307831 = 223 ⋅3765539497.

It can be written as a sum of positive squares in only one way, i.e., 138657182689 + 46335249 = 372367^2 + 6807^2 .

It is not an unprimeable number, because it can be changed into a prime (138703517933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34675879483 + ... + 34675879486.

Almost surely, 2^138703517938 is an apocalyptic number.

138703517938 is a deficient number, since it is larger than the sum of its proper divisors (69351758972).

138703517938 is an equidigital number, since it uses as much as digits as its factorization.

138703517938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69351758971.

The product of its (nonzero) digits is 3810240, while the sum is 55.

The spelling of 138703517938 in words is "one hundred thirty-eight billion, seven hundred three million, five hundred seventeen thousand, nine hundred thirty-eight".