138485 has 4 divisors (see below), whose sum is σ = 166188. Its totient is φ = 110784.

The previous prime is 138469. The next prime is 138493. The reversal of 138485 is 584831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 584831 = 13 ⋅44987.

It can be written as a sum of positive squares in 2 ways, for example, as 18769 + 119716 = 137^2 + 346^2 .

It is a cyclic number.

It is not a de Polignac number, because 138485 - 2⁴ = 138469 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, 13844 + ... + 13853.

It is an arithmetic number, because the mean of its divisors is an integer number (41547).

2¹³⁸⁴⁸⁵ is an apocalyptic number.

It is an amenable number.

138485 is a deficient number, since it is larger than the sum of its proper divisors (27703).

138485 is an equidigital number, since it uses as much as digits as its factorization.

138485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27702.

The product of its digits is 3840, while the sum is 29.

The square root of 138485 is about 372.1357279273. The cubic root of 138485 is about 51.7369606268.

The spelling of 138485 in words is "one hundred thirty-eight thousand, four hundred eighty-five".