13881218 has 8 divisors (see below), whose sum is σ = 22423548. Its totient is φ = 6406704.

The previous prime is 13881209. The next prime is 13881223. The reversal of 13881218 is 81218831.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 11135569 + 2745649 = 3337^2 + 1657^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 266921 + ... + 266972.

Almost surely, 2^13881218 is an apocalyptic number.

13881218 is a deficient number, since it is larger than the sum of its proper divisors (8542330).

13881218 is a wasteful number, since it uses less digits than its factorization.

13881218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533908.

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

The square root of 13881218 is about 3725.7506626182. The cubic root of 13881218 is about 240.3306668902.

The spelling of 13881218 in words is "thirteen million, eight hundred eighty-one thousand, two hundred eighteen".