138085 has 4 divisors (see below), whose sum is σ = 165708. Its totient is φ = 110464.

The previous prime is 138079. The next prime is 138101. The reversal of 138085 is 580831.

138085 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, and also an emirpimes, since its reverse is a distinct semiprime: 580831 = 191 ⋅3041.

It can be written as a sum of positive squares in 2 ways, for example, as 14884 + 123201 = 122^2 + 351^2 .

It is a cyclic number.

It is not a de Polignac number, because 138085 - 2³ = 138077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13804 + ... + 13813.

It is an arithmetic number, because the mean of its divisors is an integer number (41427).

2¹³⁸⁰⁸⁵ is an apocalyptic number.

It is an amenable number.

138085 is a deficient number, since it is larger than the sum of its proper divisors (27623).

138085 is an equidigital number, since it uses as much as digits as its factorization.

138085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27622.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 138085 is about 371.5979009629. The cubic root of 138085 is about 51.6871002539.

The spelling of 138085 in words is "one hundred thirty-eight thousand, eighty-five".