820812 has 24 divisors (see below), whose sum is σ = 1943536. Its totient is φ = 269568.

The previous prime is 820793. The next prime is 820837. The reversal of 820812 is 218028.

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, 408 + ... + 1344.

2⁸²⁰⁸¹² is an apocalyptic number.

It is an amenable number.

820812 is an abundant number, since it is smaller than the sum of its proper divisors (1122724).

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

820812 is a wasteful number, since it uses less digits than its factorization.

820812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1017 (or 1015 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 820812 is about 905.9867548701. The cubic root of 820812 is about 93.6299013241.

The spelling of 820812 in words is "eight hundred twenty thousand, eight hundred twelve".