12315618 has 64 divisors (see below), whose sum is σ = 32317440. Its totient is φ = 3402000.

The previous prime is 12315617. The next prime is 12315631. The reversal of 12315618 is 81651321.

12315618 is a `hidden beast` number, since 12 + 31 + 5 + 618 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 12315591 and 12315600.

It is not an unprimeable number, because it can be changed into a prime (12315613) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11193 + ... + 12243.

It is an arithmetic number, because the mean of its divisors is an integer number (504960).

Almost surely, 2^12315618 is an apocalyptic number.

12315618 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 12315618, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16158720).

12315618 is an abundant number, since it is smaller than the sum of its proper divisors (20001822).

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

12315618 is a wasteful number, since it uses less digits than its factorization.

12315618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1100 (or 1094 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 12315618 is about 3509.3614803836. The cubic root of 12315618 is about 230.9326840453.

Adding to 12315618 its reverse (81651321), we get a palindrome (93966939).

The spelling of 12315618 in words is "twelve million, three hundred fifteen thousand, six hundred eighteen".