12218305 has 8 divisors (see below), whose sum is σ = 15994944. Its totient is φ = 8886000.

The previous prime is 12218299. The next prime is 12218329. The reversal of 12218305 is 50381221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12218305 - 2¹³ = 12210113 is a prime.

It is a Duffinian number.

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, 111021 + ... + 111130.

It is an arithmetic number, because the mean of its divisors is an integer number (1999368).

Almost surely, 2^12218305 is an apocalyptic number.

It is an amenable number.

12218305 is a deficient number, since it is larger than the sum of its proper divisors (3776639).

12218305 is a wasteful number, since it uses less digits than its factorization.

12218305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222167.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 12218305 is about 3495.4692102778. The cubic root of 12218305 is about 230.3228295859.

Adding to 12218305 its reverse (50381221), we get a palindrome (62599526).

The spelling of 12218305 in words is "twelve million, two hundred eighteen thousand, three hundred five".