13439218 has 12 divisors (see below), whose sum is σ = 21829338. Its totient is φ = 6202560.

The previous prime is 13439201. The next prime is 13439219. The reversal of 13439218 is 81293431.

It can be written as a sum of positive squares in 3 ways, for example, as 3560769 + 9878449 = 1887^2 + 3143^2 .

It is a super-2 number, since 2×13439218² = 361225160903048, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13439218.

It is not an unprimeable number, because it can be changed into a prime (13439219) 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 5 ways as a sum of consecutive naturals, for example, 19543 + ... + 20218.

Almost surely, 2^13439218 is an apocalyptic number.

13439218 is a deficient number, since it is larger than the sum of its proper divisors (8390120).

13439218 is a wasteful number, since it uses less digits than its factorization.

13439218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39789 (or 39776 counting only the distinct ones).

The product of its digits is 5184, while the sum is 31.

The square root of 13439218 is about 3665.9539004194. The cubic root of 13439218 is about 237.7522667642.

The spelling of 13439218 in words is "thirteen million, four hundred thirty-nine thousand, two hundred eighteen".