138577585 has 4 divisors (see below), whose sum is σ = 166293108. Its totient is φ = 110862064.

The previous prime is 138577561. The next prime is 138577589. The reversal of 138577585 is 585775831.

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

It can be written as a sum of positive squares in 2 ways, for example, as 90801841 + 47775744 = 9529^2 + 6912^2 .

It is a cyclic number.

It is not a de Polignac number, because 138577585 - 2⁹ = 138577073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138577589) 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, 13857754 + ... + 13857763.

It is an arithmetic number, because the mean of its divisors is an integer number (41573277).

Almost surely, 2^138577585 is an apocalyptic number.

It is an amenable number.

138577585 is a deficient number, since it is larger than the sum of its proper divisors (27715523).

138577585 is an equidigital number, since it uses as much as digits as its factorization.

138577585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27715522.

The product of its digits is 1176000, while the sum is 49.

The square root of 138577585 is about 11771.8981052335. The cubic root of 138577585 is about 517.4848774627.

The spelling of 138577585 in words is "one hundred thirty-eight million, five hundred seventy-seven thousand, five hundred eighty-five".