1821984 has 24 divisors (see below), whose sum is σ = 4782960. Its totient is φ = 607296.

The previous prime is 1821959. The next prime is 1821997. The reversal of 1821984 is 4891281.

It is a tau number, because it is divible by the number of its divisors (24).

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, 9394 + ... + 9585.

It is an arithmetic number, because the mean of its divisors is an integer number (199290).

2^1821984 is an apocalyptic number.

It is an amenable number.

1821984 is an abundant number, since it is smaller than the sum of its proper divisors (2960976).

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

1821984 is a wasteful number, since it uses less digits than its factorization.

1821984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18992 (or 18984 counting only the distinct ones).

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

The square root of 1821984 is about 1349.8088753598. The cubic root of 1821984 is about 122.1372637616.

The spelling of 1821984 in words is "one million, eight hundred twenty-one thousand, nine hundred eighty-four".