12217684 has 18 divisors (see below), whose sum is σ = 22568154. Its totient is φ = 5786640.

The previous prime is 12217657. The next prime is 12217693. The reversal of 12217684 is 48671221.

It can be written as a sum of positive squares in only one way, i.e., 11696400 + 521284 = 3420^2 + 722^2 .

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2787 + ... + 5674.

Almost surely, 2^12217684 is an apocalyptic number.

It is an amenable number.

12217684 is a deficient number, since it is larger than the sum of its proper divisors (10350470).

12217684 is a wasteful number, since it uses less digits than its factorization.

12217684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8503 (or 8482 counting only the distinct ones).

The product of its digits is 5376, while the sum is 31.

The square root of 12217684 is about 3495.3803798728. The cubic root of 12217684 is about 230.3189274380.

The spelling of 12217684 in words is "twelve million, two hundred seventeen thousand, six hundred eighty-four".