138328 has 8 divisors (see below), whose sum is σ = 259380. Its totient is φ = 69160.

The previous prime is 138323. The next prime is 138337. The reversal of 138328 is 823831.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8638 + ... + 8653.

2¹³⁸³²⁸ is an apocalyptic number.

It is an amenable number.

138328 is a deficient number, since it is larger than the sum of its proper divisors (121052).

138328 is a wasteful number, since it uses less digits than its factorization.

138328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17297 (or 17293 counting only the distinct ones).

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

The square root of 138328 is about 371.9247235665. The cubic root of 138328 is about 51.7174018916.

The spelling of 138328 in words is "one hundred thirty-eight thousand, three hundred twenty-eight".