138238 has 4 divisors (see below), whose sum is σ = 207360. Its totient is φ = 69118.

The previous prime is 138209. The next prime is 138239. The reversal of 138238 is 832831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 832831 = 499 ⋅1669.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34558 + ... + 34561.

It is an arithmetic number, because the mean of its divisors is an integer number (51840).

2¹³⁸²³⁸ is an apocalyptic number.

138238 is a deficient number, since it is larger than the sum of its proper divisors (69122).

138238 is an equidigital number, since it uses as much as digits as its factorization.

138238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69121.

The product of its digits is 1152, while the sum is 25.

The square root of 138238 is about 371.8037116544. The cubic root of 138238 is about 51.7061832037.

It can be divided in two parts, 13823 and 8, that added together give a palindrome (13831).

The spelling of 138238 in words is "one hundred thirty-eight thousand, two hundred thirty-eight".