12218308 has 24 divisors (see below), whose sum is σ = 23127552. Its totient is φ = 5625984.

The previous prime is 12218299. The next prime is 12218329. The reversal of 12218308 is 80381221.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1285 + ... + 5107.

It is an arithmetic number, because the mean of its divisors is an integer number (963648).

Almost surely, 2^12218308 is an apocalyptic number.

It is an amenable number.

12218308 is a deficient number, since it is larger than the sum of its proper divisors (10909244).

12218308 is a wasteful number, since it uses less digits than its factorization.

12218308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3891 (or 3889 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 12218308 is about 3495.4696394047. The cubic root of 12218308 is about 230.3228484366.

Adding to 12218308 its reverse (80381221), we get a palindrome (92599529).

The spelling of 12218308 in words is "twelve million, two hundred eighteen thousand, three hundred eight".