138857727 has 8 divisors (see below), whose sum is σ = 185401216. Its totient is φ = 92443032.

The previous prime is 138857723. The next prime is 138857737. The reversal of 138857727 is 727758831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 138857727 - 2² = 138857723 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138857723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29653 + ... + 34014.

It is an arithmetic number, because the mean of its divisors is an integer number (23175152).

Almost surely, 2^138857727 is an apocalyptic number.

138857727 is a deficient number, since it is larger than the sum of its proper divisors (46543489).

138857727 is an equidigital number, since it uses as much as digits as its factorization.

138857727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64397.

The product of its digits is 658560, while the sum is 48.

The square root of 138857727 is about 11783.7908586329. The cubic root of 138857727 is about 517.8333505350.

It can be divided in two parts, 13885 and 7727, that added together give a palindrome (21612).

The spelling of 138857727 in words is "one hundred thirty-eight million, eight hundred fifty-seven thousand, seven hundred twenty-seven".