1813868 has 12 divisors (see below), whose sum is σ = 3627792. Its totient is φ = 777360.

The previous prime is 1813853. The next prime is 1813897. The reversal of 1813868 is 8683181.

It is a happy number.

1813868 is an admirable number.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

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, 32363 + ... + 32418.

It is an arithmetic number, because the mean of its divisors is an integer number (302316).

2^1813868 is an apocalyptic number.

It is an amenable number.

1813868 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1813868 is a wasteful number, since it uses less digits than its factorization.

1813868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64792 (or 64790 counting only the distinct ones).

The product of its digits is 9216, while the sum is 35.

The square root of 1813868 is about 1346.7991683989. The cubic root of 1813868 is about 121.9556409545.

The spelling of 1813868 in words is "one million, eight hundred thirteen thousand, eight hundred sixty-eight".