12218389 has 4 divisors (see below), whose sum is σ = 12253356. Its totient is φ = 12183424.

The previous prime is 12218363. The next prime is 12218417. The reversal of 12218389 is 98381221.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4765489 + 7452900 = 2183^2 + 2730^2 .

It is a cyclic number.

It is not a de Polignac number, because 12218389 - 2¹³ = 12210197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12218329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16954 + ... + 17659.

It is an arithmetic number, because the mean of its divisors is an integer number (3063339).

Almost surely, 2^12218389 is an apocalyptic number.

It is an amenable number.

12218389 is a deficient number, since it is larger than the sum of its proper divisors (34967).

12218389 is an equidigital number, since it uses as much as digits as its factorization.

12218389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34966.

The product of its digits is 6912, while the sum is 34.

The square root of 12218389 is about 3495.4812258114. The cubic root of 12218389 is about 230.3233574025.

The spelling of 12218389 in words is "twelve million, two hundred eighteen thousand, three hundred eighty-nine".