821794 has 8 divisors (see below), whose sum is σ = 1239660. Its totient is φ = 408576.

The previous prime is 821771. The next prime is 821801. The reversal of 821794 is 497128.

It can be written as a sum of positive squares in 2 ways, for example, as 765625 + 56169 = 875^2 + 237^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 679 + ... + 1450.

2⁸²¹⁷⁹⁴ is an apocalyptic number.

821794 is a deficient number, since it is larger than the sum of its proper divisors (417866).

821794 is a wasteful number, since it uses less digits than its factorization.

821794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2324.

The product of its digits is 4032, while the sum is 31.

The square root of 821794 is about 906.5285434006. The cubic root of 821794 is about 93.6672253076.

The spelling of 821794 in words is "eight hundred twenty-one thousand, seven hundred ninety-four".