138223 has 4 divisors (see below), whose sum is σ = 139000. Its totient is φ = 137448.

The previous prime is 138209. The next prime is 138239. The reversal of 138223 is 322831.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 322831 = 449 ⋅719.

It is a cyclic number.

It is not a de Polignac number, because 138223 - 2⁵ = 138191 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 138223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138283) 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, 28 + ... + 526.

It is an arithmetic number, because the mean of its divisors is an integer number (34750).

2¹³⁸²²³ is an apocalyptic number.

138223 is a deficient number, since it is larger than the sum of its proper divisors (777).

138223 is an equidigital number, since it uses as much as digits as its factorization.

138223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776.

The product of its digits is 288, while the sum is 19.

The square root of 138223 is about 371.7835391730. The cubic root of 138223 is about 51.7043129490.

It can be divided in two parts, 138 and 223, that added together give a square (361 = 19²).

The spelling of 138223 in words is "one hundred thirty-eight thousand, two hundred twenty-three".