12185816 has 16 divisors (see below), whose sum is σ = 23004000. Its totient is φ = 6051424.

The previous prime is 12185809. The next prime is 12185843. The reversal of 12185816 is 61858121.

It is a super-2 number, since 2×12185816² = 296988223171712, which contains 22 as substring.

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

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 3 ways as a sum of consecutive naturals, for example, 3920 + ... + 6303.

It is an arithmetic number, because the mean of its divisors is an integer number (1437750).

Almost surely, 2^12185816 is an apocalyptic number.

It is an amenable number.

12185816 is a deficient number, since it is larger than the sum of its proper divisors (10818184).

12185816 is a wasteful number, since it uses less digits than its factorization.

12185816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10378 (or 10374 counting only the distinct ones).

The product of its digits is 3840, while the sum is 32.

The square root of 12185816 is about 3490.8188151206. The cubic root of 12185816 is about 230.1185022610.

The spelling of 12185816 in words is "twelve million, one hundred eighty-five thousand, eight hundred sixteen".