138018 has 8 divisors (see below), whose sum is σ = 276048. Its totient is φ = 46004.

The previous prime is 138007. The next prime is 138041. The reversal of 138018 is 810831.

It is a happy number.

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

138018 is an admirable number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 137985 and 138003.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 138018.

It is an unprimeable number.

138018 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 in 3 ways as a sum of consecutive naturals, for example, 11496 + ... + 11507.

It is an arithmetic number, because the mean of its divisors is an integer number (34506).

2¹³⁸⁰¹⁸ is an apocalyptic number.

138018 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.

138018 is a wasteful number, since it uses less digits than its factorization.

138018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23008.

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 138018 is about 371.5077388158. The cubic root of 138018 is about 51.6787392300.

Adding to 138018 its reverse (810831), we get a palindrome (948849).

The spelling of 138018 in words is "one hundred thirty-eight thousand, eighteen".