12219685 has 16 divisors (see below), whose sum is σ = 15618096. Its totient is φ = 9146368.

The previous prime is 12219677. The next prime is 12219709. The reversal of 12219685 is 58691221.

It can be written as a sum of positive squares in 8 ways, for example, as 1760929 + 10458756 = 1327^2 + 3234^2 .

It is a cyclic number.

It is not a de Polignac number, because 12219685 - 2³ = 12219677 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 12219685.

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 15 ways as a sum of consecutive naturals, for example, 19497 + ... + 20113.

It is an arithmetic number, because the mean of its divisors is an integer number (976131).

Almost surely, 2^12219685 is an apocalyptic number.

It is an amenable number.

12219685 is a deficient number, since it is larger than the sum of its proper divisors (3398411).

12219685 is a wasteful number, since it uses less digits than its factorization.

12219685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 872.

The product of its digits is 8640, while the sum is 34.

The square root of 12219685 is about 3495.6666030959. Note that the first 4 decimals coincide. The cubic root of 12219685 is about 230.3315005524.

The spelling of 12219685 in words is "twelve million, two hundred nineteen thousand, six hundred eighty-five".