138365 has 4 divisors (see below), whose sum is σ = 166044. Its totient is φ = 110688.

The previous prime is 138349. The next prime is 138371. The reversal of 138365 is 563831.

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 17956 + 120409 = 134^2 + 347^2 .

It is a cyclic number.

It is not a de Polignac number, because 138365 - 2⁴ = 138349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 138365.

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, 13832 + ... + 13841.

It is an arithmetic number, because the mean of its divisors is an integer number (41511).

2¹³⁸³⁶⁵ is an apocalyptic number.

It is an amenable number.

138365 is a deficient number, since it is larger than the sum of its proper divisors (27679).

138365 is an equidigital number, since it uses as much as digits as its factorization.

138365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27678.

The product of its digits is 2160, while the sum is 26.

The square root of 138365 is about 371.9744614890. The cubic root of 138365 is about 51.7220126074.

The spelling of 138365 in words is "one hundred thirty-eight thousand, three hundred sixty-five".