12218547 has 16 divisors (see below), whose sum is σ = 18254592. Its totient is φ = 7204320.

The previous prime is 12218537. The next prime is 12218587. The reversal of 12218547 is 74581221.

It is not a de Polignac number, because 12218547 - 2¹¹ = 12216499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12218527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3783 + ... + 6224.

It is an arithmetic number, because the mean of its divisors is an integer number (1140912).

Almost surely, 2^12218547 is an apocalyptic number.

12218547 is a deficient number, since it is larger than the sum of its proper divisors (6036045).

12218547 is a wasteful number, since it uses less digits than its factorization.

12218547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10058.

The product of its digits is 4480, while the sum is 30.

The square root of 12218547 is about 3495.5038263461. The cubic root of 12218547 is about 230.3243501939.

Adding to 12218547 its reverse (74581221), we get a palindrome (86799768).

The spelling of 12218547 in words is "twelve million, two hundred eighteen thousand, five hundred forty-seven".