790821 has 6 divisors (see below), whose sum is σ = 1142310. Its totient is φ = 527208.

The previous prime is 790819. The next prime is 790831. The reversal of 790821 is 128097.

790821 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 476100 + 314721 = 690^2 + 561^2 .

It is not a de Polignac number, because 790821 - 2¹ = 790819 is a prime.

790821 is strictly pandigital in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (790831) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 43926 + ... + 43943.

It is an arithmetic number, because the mean of its divisors is an integer number (190385).

2⁷⁹⁰⁸²¹ is an apocalyptic number.

It is an amenable number.

790821 is a deficient number, since it is larger than the sum of its proper divisors (351489).

790821 is a wasteful number, since it uses less digits than its factorization.

790821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87875 (or 87872 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 790821 is about 889.2811703843. The cubic root of 790821 is about 92.4753671930.

The spelling of 790821 in words is "seven hundred ninety thousand, eight hundred twenty-one".