12318138 has 48 divisors (see below), whose sum is σ = 31037760. Its totient is φ = 3457728.

The previous prime is 12318109. The next prime is 12318143. The reversal of 12318138 is 83181321.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6606 + ... + 8262.

It is an arithmetic number, because the mean of its divisors is an integer number (646620).

Almost surely, 2^12318138 is an apocalyptic number.

12318138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12318138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15518880).

12318138 is an abundant number, since it is smaller than the sum of its proper divisors (18719622).

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

12318138 is a wasteful number, since it uses less digits than its factorization.

12318138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1731 (or 1728 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 12318138 is about 3509.7205016924. The cubic root of 12318138 is about 230.9484339837.

Adding to 12318138 its reverse (83181321), we get a palindrome (95499459).

The spelling of 12318138 in words is "twelve million, three hundred eighteen thousand, one hundred thirty-eight".