12123618 has 64 divisors (see below), whose sum is σ = 28449792. Its totient is φ = 3409920.

The previous prime is 12123607. The next prime is 12123637. The reversal of 12123618 is 81632121.

It is a super-2 number, since 2×12123618² = 293964226819848, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 54255 + ... + 54477.

It is an arithmetic number, because the mean of its divisors is an integer number (444528).

Almost surely, 2^12123618 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12123618, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14224896).

12123618 is an abundant number, since it is smaller than the sum of its proper divisors (16326174).

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

12123618 is a wasteful number, since it uses less digits than its factorization.

12123618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299.

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

The square root of 12123618 is about 3481.8986200060. The cubic root of 12123618 is about 229.7263159260.

Adding to 12123618 its reverse (81632121), we get a palindrome (93755739).

The spelling of 12123618 in words is "twelve million, one hundred twenty-three thousand, six hundred eighteen".