138717206439 has 16 divisors (see below), whose sum is σ = 211383846912. Its totient is φ = 79265007648.

The previous prime is 138717206413. The next prime is 138717206461. The reversal of 138717206439 is 934602717831.

It is a happy number.

It is not a de Polignac number, because 138717206439 - 2⁸ = 138717206183 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138717206391 and 138717206400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138717206479) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1450177 + ... + 1542869.

It is an arithmetic number, because the mean of its divisors is an integer number (13211490432).

Almost surely, 2^138717206439 is an apocalyptic number.

138717206439 is a deficient number, since it is larger than the sum of its proper divisors (72666640473).

138717206439 is an equidigital number, since it uses as much as digits as its factorization.

138717206439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163966.

The product of its (nonzero) digits is 1524096, while the sum is 51.

The spelling of 138717206439 in words is "one hundred thirty-eight billion, seven hundred seventeen million, two hundred six thousand, four hundred thirty-nine".