12321618 has 8 divisors (see below), whose sum is σ = 24643248. Its totient is φ = 4107204.

The previous prime is 12321611. The next prime is 12321637. The reversal of 12321618 is 81612321.

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

12321618 is an admirable number.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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

It is not an unprimeable number, because it can be changed into a prime (12321611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1026796 + ... + 1026807.

It is an arithmetic number, because the mean of its divisors is an integer number (3080406).

Almost surely, 2^12321618 is an apocalyptic number.

12321618 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.

12321618 is a wasteful number, since it uses less digits than its factorization.

12321618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2053608.

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

The square root of 12321618 is about 3510.2162326558. The cubic root of 12321618 is about 230.9701803677.

Adding to 12321618 its reverse (81612321), we get a palindrome (93933939).

It can be divided in two parts, 1232 and 1618, that added together give a triangular number (2850 = T₇₅).

The spelling of 12321618 in words is "twelve million, three hundred twenty-one thousand, six hundred eighteen".