13613818 has 8 divisors (see below), whose sum is σ = 21124980. Its totient is φ = 6572160.

The previous prime is 13613813. The next prime is 13613857. The reversal of 13613818 is 81831631.

It can be written as a sum of positive squares in 2 ways, for example, as 13417569 + 196249 = 3663^2 + 443^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 13613818.

It is not an unprimeable number, because it can be changed into a prime (13613813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117303 + ... + 117418.

Almost surely, 2^13613818 is an apocalyptic number.

13613818 is a deficient number, since it is larger than the sum of its proper divisors (7511162).

13613818 is a wasteful number, since it uses less digits than its factorization.

13613818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234752.

The product of its digits is 3456, while the sum is 31.

The square root of 13613818 is about 3689.6907729510. The cubic root of 13613818 is about 238.7774519570. Note that the first 3 decimals are identical.

The spelling of 13613818 in words is "thirteen million, six hundred thirteen thousand, eight hundred eighteen".