13661218 has 8 divisors (see below), whose sum is σ = 21382848. Its totient is φ = 6533604.

The previous prime is 13661201. The next prime is 13661231. The reversal of 13661218 is 81216631.

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

It is a super-3 number, since 3×13661218³ (a number of 22 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148446 + ... + 148537.

It is an arithmetic number, because the mean of its divisors is an integer number (2672856).

Almost surely, 2^13661218 is an apocalyptic number.

13661218 is a deficient number, since it is larger than the sum of its proper divisors (7721630).

13661218 is a wasteful number, since it uses less digits than its factorization.

13661218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297008.

The product of its digits is 1728, while the sum is 28.

The square root of 13661218 is about 3696.1084940786. The cubic root of 13661218 is about 239.0542526068.

Adding to 13661218 its reverse (81216631), we get a palindrome (94877849).

The spelling of 13661218 in words is "thirteen million, six hundred sixty-one thousand, two hundred eighteen".