12517218 has 48 divisors (see below), whose sum is σ = 31764096. Its totient is φ = 3487680.

The previous prime is 12517217. The next prime is 12517231. The reversal of 12517218 is 81271521.

It is a junction number, because it is equal to n+sod(n) for n = 12517191 and 12517200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12517217) by changing a digit.

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, 3955 + ... + 6377.

It is an arithmetic number, because the mean of its divisors is an integer number (661752).

Almost surely, 2^12517218 is an apocalyptic number.

12517218 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 12517218, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15882048).

12517218 is an abundant number, since it is smaller than the sum of its proper divisors (19246878).

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

12517218 is a wasteful number, since it uses less digits than its factorization.

12517218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2479 (or 2476 counting only the distinct ones).

The product of its digits is 1120, while the sum is 27.

The square root of 12517218 is about 3537.9680609073. The cubic root of 12517218 is about 232.1859512941.

Adding to 12517218 its reverse (81271521), we get a palindrome (93788739).

The spelling of 12517218 in words is "twelve million, five hundred seventeen thousand, two hundred eighteen".