804921 has 8 divisors (see below), whose sum is σ = 1155840. Its totient is φ = 495312.

The previous prime is 804919. The next prime is 804929. The reversal of 804921 is 129408.

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

It is not a de Polignac number, because 804921 - 2¹ = 804919 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 804891 and 804900.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 804921.

It is not an unprimeable number, because it can be changed into a prime (804929) 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, 10281 + ... + 10358.

It is an arithmetic number, because the mean of its divisors is an integer number (144480).

2⁸⁰⁴⁹²¹ is an apocalyptic number.

It is an amenable number.

804921 is a deficient number, since it is larger than the sum of its proper divisors (350919).

804921 is a wasteful number, since it uses less digits than its factorization.

804921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20655.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 804921 is about 897.1738961874. The cubic root of 804921 is about 93.0217315385.

The spelling of 804921 in words is "eight hundred four thousand, nine hundred twenty-one".