1821868 has 12 divisors (see below), whose sum is σ = 3197880. Its totient is φ = 908192.

The previous prime is 1821857. The next prime is 1821871. The reversal of 1821868 is 8681281.

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, 1848 + ... + 2656.

It is an arithmetic number, because the mean of its divisors is an integer number (266490).

2^1821868 is an apocalyptic number.

It is an amenable number.

1821868 is a deficient number, since it is larger than the sum of its proper divisors (1376012).

1821868 is a wasteful number, since it uses less digits than its factorization.

1821868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376 (or 1374 counting only the distinct ones).

The product of its digits is 6144, while the sum is 34.

The square root of 1821868 is about 1349.7659056296. The cubic root of 1821868 is about 122.1346716746.

The spelling of 1821868 in words is "one million, eight hundred twenty-one thousand, eight hundred sixty-eight".