12108138 has 32 divisors (see below), whose sum is σ = 28632960. Its totient is φ = 3339840.

The previous prime is 12108137. The next prime is 12108169. The reversal of 12108138 is 83180121.

It is not an unprimeable number, because it can be changed into a prime (12108133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3753 + ... + 6188.

It is an arithmetic number, because the mean of its divisors is an integer number (894780).

Almost surely, 2^12108138 is an apocalyptic number.

12108138 is an abundant number, since it is smaller than the sum of its proper divisors (16524822).

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

12108138 is a wasteful number, since it uses less digits than its factorization.

12108138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9982.

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 12108138 is about 3479.6749848226. The cubic root of 12108138 is about 229.6284991960.

Adding to 12108138 its reverse (83180121), we get a palindrome (95288259).

It can be divided in two parts, 12108 and 138, that added together give a triangular number (12246 = T₁₅₆).

The spelling of 12108138 in words is "twelve million, one hundred eight thousand, one hundred thirty-eight".