13218422 has 16 divisors (see below), whose sum is σ = 23645952. Its totient is φ = 5418600.

The previous prime is 13218409. The next prime is 13218463. The reversal of 13218422 is 22481231.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 20204 + ... + 20847.

It is an arithmetic number, because the mean of its divisors is an integer number (1477872).

Almost surely, 2^13218422 is an apocalyptic number.

13218422 is a deficient number, since it is larger than the sum of its proper divisors (10427530).

13218422 is a wasteful number, since it uses less digits than its factorization.

13218422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41083.

The product of its digits is 768, while the sum is 23.

The square root of 13218422 is about 3635.7147852933. The cubic root of 13218422 is about 236.4430416464.

Adding to 13218422 its reverse (22481231), we get a palindrome (35699653).

The spelling of 13218422 in words is "thirteen million, two hundred eighteen thousand, four hundred twenty-two".