12218287 has 8 divisors (see below), whose sum is σ = 12579840. Its totient is φ = 11859840.

The previous prime is 12218243. The next prime is 12218299. The reversal of 12218287 is 78281221.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12218287 is a prime.

It is a Duffinian number.

It is a zygodrome in base 5.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12218207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8914 + ... + 10192.

It is an arithmetic number, because the mean of its divisors is an integer number (1572480).

Almost surely, 2^12218287 is an apocalyptic number.

12218287 is a deficient number, since it is larger than the sum of its proper divisors (361553).

12218287 is a wasteful number, since it uses less digits than its factorization.

12218287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1553.

The product of its digits is 3584, while the sum is 31.

The square root of 12218287 is about 3495.4666355152. The cubic root of 12218287 is about 230.3227164820.

The spelling of 12218287 in words is "twelve million, two hundred eighteen thousand, two hundred eighty-seven".