138435727 has 4 divisors (see below), whose sum is σ = 141381216. Its totient is φ = 135490240.

The previous prime is 138435707. The next prime is 138435757. The reversal of 138435727 is 727534831.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138435727 - 2¹¹ = 138433679 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138435727.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138435707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1472674 + ... + 1472767.

It is an arithmetic number, because the mean of its divisors is an integer number (35345304).

Almost surely, 2^138435727 is an apocalyptic number.

138435727 is a deficient number, since it is larger than the sum of its proper divisors (2945489).

138435727 is an equidigital number, since it uses as much as digits as its factorization.

138435727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2945488.

The product of its digits is 141120, while the sum is 40.

The square root of 138435727 is about 11765.8712809549. The cubic root of 138435727 is about 517.3082389078.

The spelling of 138435727 in words is "one hundred thirty-eight million, four hundred thirty-five thousand, seven hundred twenty-seven".