13663218 has 16 divisors (see below), whose sum is σ = 27408096. Its totient is φ = 4540800.

The previous prime is 13663217. The next prime is 13663231. The reversal of 13663218 is 81236631.

It is a super-2 number, since 2×13663218² = 373367052231048, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13663217) 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, 1108 + ... + 5343.

It is an arithmetic number, because the mean of its divisors is an integer number (1713006).

Almost surely, 2^13663218 is an apocalyptic number.

13663218 is an abundant number, since it is smaller than the sum of its proper divisors (13744878).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13663218 is a wasteful number, since it uses less digits than its factorization.

13663218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6809.

The product of its digits is 5184, while the sum is 30.

The square root of 13663218 is about 3696.3790390056. The cubic root of 13663218 is about 239.0659178716.

Adding to 13663218 its reverse (81236631), we get a palindrome (94899849).

The spelling of 13663218 in words is "thirteen million, six hundred sixty-three thousand, two hundred eighteen".