13218722 has 16 divisors (see below), whose sum is σ = 22377600. Its totient is φ = 5801040.

The previous prime is 13218701. The next prime is 13218727. The reversal of 13218722 is 22781231.

13218722 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×13218722² = 349469222626568, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13218691 and 13218700.

It is not an unprimeable number, because it can be changed into a prime (13218727) 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, 9722 + ... + 10997.

It is an arithmetic number, because the mean of its divisors is an integer number (1398600).

Almost surely, 2^13218722 is an apocalyptic number.

13218722 is a deficient number, since it is larger than the sum of its proper divisors (9158878).

13218722 is a wasteful number, since it uses less digits than its factorization.

13218722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20761.

The product of its digits is 1344, while the sum is 26.

The square root of 13218722 is about 3635.7560424209. The cubic root of 13218722 is about 236.4448303717. Note that the first 3 decimals are identical.

Adding to 13218722 its reverse (22781231), we get a palindrome (35999953).

The spelling of 13218722 in words is "thirteen million, two hundred eighteen thousand, seven hundred twenty-two".