804021 has 8 divisors (see below), whose sum is σ = 1085280. Its totient is φ = 529392.

The previous prime is 804017. The next prime is 804031. The reversal of 804021 is 120408.

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

It is not a de Polignac number, because 804021 - 2² = 804017 is a prime.

804021 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 804021.

It is not an unprimeable number, because it can be changed into a prime (804031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1366 + ... + 1863.

It is an arithmetic number, because the mean of its divisors is an integer number (135660).

2⁸⁰⁴⁰²¹ is an apocalyptic number.

It is an amenable number.

804021 is a deficient number, since it is larger than the sum of its proper divisors (281259).

804021 is a wasteful number, since it uses less digits than its factorization.

804021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3315.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 804021 is about 896.6721809000. The cubic root of 804021 is about 92.9870487225.

Adding to 804021 its reverse (120408), we get a palindrome (924429).

The spelling of 804021 in words is "eight hundred four thousand, twenty-one".