138318 has 8 divisors (see below), whose sum is σ = 276648. Its totient is φ = 46104.

The previous prime is 138311. The next prime is 138319. The reversal of 138318 is 813831.

It is a sphenic number, since it is the product of 3 distinct primes.

138318 is an admirable number.

It is a Curzon 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 138318.

It is not an unprimeable number, because it can be changed into a prime (138311) by changing a digit.

138318 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11521 + ... + 11532.

It is an arithmetic number, because the mean of its divisors is an integer number (34581).

2¹³⁸³¹⁸ is an apocalyptic number.

138318 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138318 is a wasteful number, since it uses less digits than its factorization.

138318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23058.

The product of its digits is 576, while the sum is 24.

The square root of 138318 is about 371.9112797429. The cubic root of 138318 is about 51.7161556111.

The spelling of 138318 in words is "one hundred thirty-eight thousand, three hundred eighteen".