13638218 has 16 divisors (see below), whose sum is σ = 23288256. Its totient is φ = 5929440.

The previous prime is 13638211. The next prime is 13638223. The reversal of 13638218 is 81283631.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (13638211) 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, 12971 + ... + 13982.

It is an arithmetic number, because the mean of its divisors is an integer number (1455516).

Almost surely, 2^13638218 is an apocalyptic number.

13638218 is a deficient number, since it is larger than the sum of its proper divisors (9650038).

13638218 is a wasteful number, since it uses less digits than its factorization.

13638218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26989.

The product of its digits is 6912, while the sum is 32.

The square root of 13638218 is about 3692.9958028679. The cubic root of 13638218 is about 238.9200201562.

The spelling of 13638218 in words is "thirteen million, six hundred thirty-eight thousand, two hundred eighteen".