1821944 has 8 divisors (see below), whose sum is σ = 3416160. Its totient is φ = 910968.

The previous prime is 1821943. The next prime is 1821959. The reversal of 1821944 is 4491281.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1821943) by changing a digit.

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 as a sum of consecutive naturals, namely, 113864 + ... + 113879.

It is an arithmetic number, because the mean of its divisors is an integer number (427020).

2^1821944 is an apocalyptic number.

It is an amenable number.

1821944 is a deficient number, since it is larger than the sum of its proper divisors (1594216).

1821944 is a wasteful number, since it uses less digits than its factorization.

1821944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227749 (or 227745 counting only the distinct ones).

The product of its digits is 2304, while the sum is 29.

The square root of 1821944 is about 1349.7940583659. The cubic root of 1821944 is about 122.1363699509.

The spelling of 1821944 in words is "one million, eight hundred twenty-one thousand, nine hundred forty-four".