138642593 has 4 divisors (see below), whose sum is σ = 138908208. Its totient is φ = 138376980.

The previous prime is 138642587. The next prime is 138642617. The reversal of 138642593 is 395246831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 138642593 - 2⁸ = 138642337 is a prime.

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 138642593.

It is not an unprimeable number, because it can be changed into a prime (138642583) 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, 132023 + ... + 133068.

It is an arithmetic number, because the mean of its divisors is an integer number (34727052).

Almost surely, 2^138642593 is an apocalyptic number.

It is an amenable number.

138642593 is a deficient number, since it is larger than the sum of its proper divisors (265615).

138642593 is an equidigital number, since it uses as much as digits as its factorization.

138642593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265614.

The product of its digits is 155520, while the sum is 41.

The square root of 138642593 is about 11774.6589334893. The cubic root of 138642593 is about 517.5657837600.

The spelling of 138642593 in words is "one hundred thirty-eight million, six hundred forty-two thousand, five hundred ninety-three".