804492921 has 16 divisors (see below), whose sum is σ = 1146182400. Its totient is φ = 500145408.

The previous prime is 804492911. The next prime is 804492947. The reversal of 804492921 is 129294408.

It is not a de Polignac number, because 804492921 - 2¹⁷ = 804361849 is a prime.

It is a super-2 number, since 2×804492921² = 1294417719878224482, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 804492921.

It is not an unprimeable number, because it can be changed into a prime (804492911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66801 + ... + 77918.

It is an arithmetic number, because the mean of its divisors is an integer number (71636400).

Almost surely, 2^804492921 is an apocalyptic number.

It is an amenable number.

804492921 is a deficient number, since it is larger than the sum of its proper divisors (341689479).

804492921 is a wasteful number, since it uses less digits than its factorization.

804492921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144848.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 804492921 is about 28363.5844173475. The cubic root of 804492921 is about 930.0523811403.

The spelling of 804492921 in words is "eight hundred four million, four hundred ninety-two thousand, nine hundred twenty-one".