13681818 has 16 divisors (see below), whose sum is σ = 30404160. Its totient is φ = 4560588.

The previous prime is 13681813. The next prime is 13681853. The reversal of 13681818 is 81818631.

13681818 is a modest number, since divided by 1818 gives 1368 as remainder.

It is not an unprimeable number, because it can be changed into a prime (13681813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126630 + ... + 126737.

It is an arithmetic number, because the mean of its divisors is an integer number (1900260).

Almost surely, 2^13681818 is an apocalyptic number.

13681818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

13681818 is an abundant number, since it is smaller than the sum of its proper divisors (16722342).

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

13681818 is a wasteful number, since it uses less digits than its factorization.

13681818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253378 (or 253372 counting only the distinct ones).

The product of its digits is 9216, while the sum is 36.

The square root of 13681818 is about 3698.8941590697. The cubic root of 13681818 is about 239.1743503516.

The spelling of 13681818 in words is "thirteen million, six hundred eighty-one thousand, eight hundred eighteen".