12218847 has 4 divisors (see below), whose sum is σ = 16291800. Its totient is φ = 8145896.

The previous prime is 12218821. The next prime is 12218873. The reversal of 12218847 is 74881221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (12218821) and next prime (12218873).

It is a cyclic number.

It is not a de Polignac number, because 12218847 - 2⁶ = 12218783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12218897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2036472 + ... + 2036477.

It is an arithmetic number, because the mean of its divisors is an integer number (4072950).

Almost surely, 2^12218847 is an apocalyptic number.

12218847 is a deficient number, since it is larger than the sum of its proper divisors (4072953).

12218847 is an equidigital number, since it uses as much as digits as its factorization.

12218847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4072952.

The product of its digits is 7168, while the sum is 33.

The square root of 12218847 is about 3495.5467383515. The cubic root of 12218847 is about 230.3262352173.

The spelling of 12218847 in words is "twelve million, two hundred eighteen thousand, eight hundred forty-seven".