822840 has 32 divisors (see below), whose sum is σ = 2468880. Its totient is φ = 219392.

The previous prime is 822839. The next prime is 822853. The reversal of 822840 is 48228.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 822840.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3309 + ... + 3548.

2⁸²²⁸⁴⁰ is an apocalyptic number.

It is an amenable number.

822840 is an abundant number, since it is smaller than the sum of its proper divisors (1646040).

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

822840 is a wasteful number, since it uses less digits than its factorization.

822840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6871 (or 6867 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 822840 is about 907.1052860611. The cubic root of 822840 is about 93.7069491225.

The spelling of 822840 in words is "eight hundred twenty-two thousand, eight hundred forty".