138225727 has 4 divisors (see below), whose sum is σ = 138440016. Its totient is φ = 138011440.

The previous prime is 138225721. The next prime is 138225743. The reversal of 138225727 is 727522831.

138225727 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 138225727 - 2¹⁹ = 137701439 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 (138225721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106174 + ... + 107467.

It is an arithmetic number, because the mean of its divisors is an integer number (34610004).

Almost surely, 2^138225727 is an apocalyptic number.

138225727 is a deficient number, since it is larger than the sum of its proper divisors (214289).

138225727 is an equidigital number, since it uses as much as digits as its factorization.

138225727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214288.

The product of its digits is 47040, while the sum is 37.

The square root of 138225727 is about 11756.9437780403. The cubic root of 138225727 is about 517.0465297137.

The spelling of 138225727 in words is "one hundred thirty-eight million, two hundred twenty-five thousand, seven hundred twenty-seven".