12218402 has 32 divisors (see below), whose sum is σ = 22118400. Its totient is φ = 4951440.

The previous prime is 12218363. The next prime is 12218417. The reversal of 12218402 is 20481221.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20099 + ... + 20697.

It is an arithmetic number, because the mean of its divisors is an integer number (691200).

Almost surely, 2^12218402 is an apocalyptic number.

12218402 is a deficient number, since it is larger than the sum of its proper divisors (9899998).

12218402 is a wasteful number, since it uses less digits than its factorization.

12218402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 12218402 is about 3495.4830853546. The cubic root of 12218402 is about 230.3234390882.

Adding to 12218402 its reverse (20481221), we get a palindrome (32699623).

The spelling of 12218402 in words is "twelve million, two hundred eighteen thousand, four hundred two".