13381818 has 16 divisors (see below), whose sum is σ = 27686880. Its totient is φ = 4306736.

The previous prime is 13381817. The next prime is 13381853. The reversal of 13381818 is 81818331.

13381818 is a modest number, since divided by 1818 gives 1338 as remainder.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13381813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38280 + ... + 38627.

It is an arithmetic number, because the mean of its divisors is an integer number (1730430).

Almost surely, 2^13381818 is an apocalyptic number.

13381818 is an abundant number, since it is smaller than the sum of its proper divisors (14305062).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13381818 is a wasteful number, since it uses less digits than its factorization.

13381818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76941.

The product of its digits is 4608, while the sum is 33.

The square root of 13381818 is about 3658.1167285914. The cubic root of 13381818 is about 237.4132972530.

The spelling of 13381818 in words is "thirteen million, three hundred eighty-one thousand, eight hundred eighteen".