13218244 has 12 divisors (see below), whose sum is σ = 24911404. Its totient is φ = 6100704.

The previous prime is 13218209. The next prime is 13218263. The reversal of 13218244 is 44281231.

It can be written as a sum of positive squares in 2 ways, for example, as 544644 + 12673600 = 738^2 + 3560^2 .

It is an unprimeable number.

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, 127047 + ... + 127150.

Almost surely, 2^13218244 is an apocalyptic number.

It is an amenable number.

13218244 is a deficient number, since it is larger than the sum of its proper divisors (11693160).

13218244 is a wasteful number, since it uses less digits than its factorization.

13218244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254214 (or 254212 counting only the distinct ones).

The product of its digits is 1536, while the sum is 25.

The square root of 13218244 is about 3635.6903058429. The cubic root of 13218244 is about 236.4419803233.

Adding to 13218244 its reverse (44281231), we get a palindrome (57499475).

The spelling of 13218244 in words is "thirteen million, two hundred eighteen thousand, two hundred forty-four".