13218393 has 8 divisors (see below), whose sum is σ = 17653408. Its totient is φ = 8797824.

The previous prime is 13218379. The next prime is 13218397. The reversal of 13218393 is 39381231.

13218393 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 13218393 - 2¹⁴ = 13202009 is a prime.

It is a super-3 number, since 3×13218393³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13218393.

It is not an unprimeable number, because it can be changed into a prime (13218397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1255 + ... + 5292.

It is an arithmetic number, because the mean of its divisors is an integer number (2206676).

Almost surely, 2^13218393 is an apocalyptic number.

It is an amenable number.

13218393 is a deficient number, since it is larger than the sum of its proper divisors (4435015).

13218393 is an equidigital number, since it uses as much as digits as its factorization.

13218393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7223.

The product of its digits is 3888, while the sum is 30.

The square root of 13218393 is about 3635.7107970794. The cubic root of 13218393 is about 236.4428687349.

The spelling of 13218393 in words is "thirteen million, two hundred eighteen thousand, three hundred ninety-three".