12218425 has 24 divisors (see below), whose sum is σ = 16516800. Its totient is φ = 8930880.

The previous prime is 12218417. The next prime is 12218443. The reversal of 12218425 is 52481221.

12218425 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12218425 - 2³ = 12218417 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a zygodrome in base 5.

It is a self number, because there is not a number n which added to its sum of digits gives 12218425.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13332 + ... + 14218.

It is an arithmetic number, because the mean of its divisors is an integer number (688200).

Almost surely, 2^12218425 is an apocalyptic number.

It is an amenable number.

12218425 is a deficient number, since it is larger than the sum of its proper divisors (4298375).

12218425 is a wasteful number, since it uses less digits than its factorization.

12218425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 945 (or 940 counting only the distinct ones).

The product of its digits is 1280, while the sum is 25.

The square root of 12218425 is about 3495.4863753132. The cubic root of 12218425 is about 230.3235836089.

Adding to 12218425 its reverse (52481221), we get a palindrome (64699646).

The spelling of 12218425 in words is "twelve million, two hundred eighteen thousand, four hundred twenty-five".