13818218 has 4 divisors (see below), whose sum is σ = 20727330. Its totient is φ = 6909108.

The previous prime is 13818199. The next prime is 13818223. The reversal of 13818218 is 81281831.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81281831 = 89 ⋅913279.

It can be written as a sum of positive squares in only one way, i.e., 7879249 + 5938969 = 2807^2 + 2437^2 .

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 as a sum of consecutive naturals, namely, 3454553 + ... + 3454556.

Almost surely, 2^13818218 is an apocalyptic number.

13818218 is a deficient number, since it is larger than the sum of its proper divisors (6909112).

13818218 is an equidigital number, since it uses as much as digits as its factorization.

13818218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6909111.

The product of its digits is 3072, while the sum is 32.

The square root of 13818218 is about 3717.2863758392. The cubic root of 13818218 is about 239.9665346857.

The spelling of 13818218 in words is "thirteen million, eight hundred eighteen thousand, two hundred eighteen".