12218815 has 8 divisors (see below), whose sum is σ = 16757280. Its totient is φ = 8378592.

The previous prime is 12218783. The next prime is 12218821. The reversal of 12218815 is 51881221.

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

It is a cyclic number.

It is not a de Polignac number, because 12218815 - 2⁵ = 12218783 is a prime.

It is a congruent 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, 174520 + ... + 174589.

It is an arithmetic number, because the mean of its divisors is an integer number (2094660).

Almost surely, 2^12218815 is an apocalyptic number.

12218815 is a deficient number, since it is larger than the sum of its proper divisors (4538465).

12218815 is an equidigital number, since it uses as much as digits as its factorization.

12218815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349121.

The product of its digits is 1280, while the sum is 28.

The square root of 12218815 is about 3495.5421610960. The cubic root of 12218815 is about 230.3260341496.

The spelling of 12218815 in words is "twelve million, two hundred eighteen thousand, eight hundred fifteen".