821944 has 16 divisors (see below), whose sum is σ = 1555200. Its totient is φ = 407232.

The previous prime is 821941. The next prime is 821971. The reversal of 821944 is 449128.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 612 + ... + 1420.

It is an arithmetic number, because the mean of its divisors is an integer number (97200).

2⁸²¹⁹⁴⁴ is an apocalyptic number.

It is an amenable number.

821944 is a deficient number, since it is larger than the sum of its proper divisors (733256).

821944 is a wasteful number, since it uses less digits than its factorization.

821944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 942 (or 938 counting only the distinct ones).

The product of its digits is 2304, while the sum is 28.

The square root of 821944 is about 906.6112728176. The cubic root of 821944 is about 93.6729239089.

Subtracting from 821944 its reverse (449128), we obtain a triangular number (372816 = T₈₆₃).

It can be divided in two parts, 8 and 21944, that added together give a cube (21952 = 28³).

The spelling of 821944 in words is "eight hundred twenty-one thousand, nine hundred forty-four".