13218472 has 16 divisors (see below), whose sum is σ = 25455060. Its totient is φ = 6430464.

The previous prime is 13218463. The next prime is 13218473. The reversal of 13218472 is 27481231.

It can be written as a sum of positive squares in 2 ways, for example, as 12489156 + 729316 = 3534^2 + 854^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 13218472.

It is not an unprimeable number, because it can be changed into a prime (13218473) 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, 22033 + ... + 22624.

Almost surely, 2^13218472 is an apocalyptic number.

It is an amenable number.

13218472 is a deficient number, since it is larger than the sum of its proper divisors (12236588).

13218472 is a wasteful number, since it uses less digits than its factorization.

13218472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44700 (or 44696 counting only the distinct ones).

The product of its digits is 2688, while the sum is 28.

The square root of 13218472 is about 3635.7216615137. The cubic root of 13218472 is about 236.4433397692.

The spelling of 13218472 in words is "thirteen million, two hundred eighteen thousand, four hundred seventy-two".