804033821 has 4 divisors (see below), whose sum is σ = 823644444. Its totient is φ = 784423200.

The previous prime is 804033817. The next prime is 804033833. The reversal of 804033821 is 128330408.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 131928196 + 672105625 = 11486^2 + 25925^2 .

It is a cyclic number.

It is not a de Polignac number, because 804033821 - 2² = 804033817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (804033851) 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, 9805250 + ... + 9805331.

It is an arithmetic number, because the mean of its divisors is an integer number (205911111).

Almost surely, 2^804033821 is an apocalyptic number.

It is an amenable number.

804033821 is a deficient number, since it is larger than the sum of its proper divisors (19610623).

804033821 is a wasteful number, since it uses less digits than its factorization.

804033821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19610622.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 804033821 is about 28355.4901385957. The cubic root of 804033821 is about 929.8754298021.

The spelling of 804033821 in words is "eight hundred four million, thirty-three thousand, eight hundred twenty-one".