804504921 has 24 divisors (see below), whose sum is σ = 1219727040. Its totient is φ = 470759520.

The previous prime is 804504917. The next prime is 804504937. The reversal of 804504921 is 129405408.

It is not a de Polignac number, because 804504921 - 2² = 804504917 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (804504941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27685 + ... + 48738.

It is an arithmetic number, because the mean of its divisors is an integer number (50821960).

Almost surely, 2^804504921 is an apocalyptic number.

It is an amenable number.

804504921 is a deficient number, since it is larger than the sum of its proper divisors (415222119).

804504921 is a wasteful number, since it uses less digits than its factorization.

804504921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76477 (or 76466 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 804504921 is about 28363.7959554077. The cubic root of 804504921 is about 930.0570054085.

The spelling of 804504921 in words is "eight hundred four million, five hundred four thousand, nine hundred twenty-one".