138394 has 4 divisors (see below), whose sum is σ = 207594. Its totient is φ = 69196.

The previous prime is 138389. The next prime is 138401. The reversal of 138394 is 493831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 493831 = 13 ⋅37987.

It can be written as a sum of positive squares in only one way, i.e., 93025 + 45369 = 305^2 + 213^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34597 + ... + 34600.

2¹³⁸³⁹⁴ is an apocalyptic number.

138394 is a deficient number, since it is larger than the sum of its proper divisors (69200).

138394 is an equidigital number, since it uses as much as digits as its factorization.

138394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69199.

The product of its digits is 2592, while the sum is 28.

The square root of 138394 is about 372.0134406174. The cubic root of 138394 is about 51.7256258371.

The spelling of 138394 in words is "one hundred thirty-eight thousand, three hundred ninety-four".