804793721 has 2 divisors, whose sum is σ = 804793722. Its totient is φ = 804793720.

The previous prime is 804793657. The next prime is 804793723. The reversal of 804793721 is 127397408.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 728406121 + 76387600 = 26989^2 + 8740^2 .

It is a cyclic number.

It is not a de Polignac number, because 804793721 - 2⁶ = 804793657 is a prime.

It is a super-2 number, since 2×804793721² = 1295385866722051682, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 804793723, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (804793723) 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 as a sum of consecutive naturals, namely, 402396860 + 402396861.

It is an arithmetic number, because the mean of its divisors is an integer number (402396861).

Almost surely, 2^804793721 is an apocalyptic number.

It is an amenable number.

804793721 is a deficient number, since it is larger than the sum of its proper divisors (1).

804793721 is an equidigital number, since it uses as much as digits as its factorization.

804793721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 804793721 is about 28368.8864955958. The cubic root of 804793721 is about 930.1682822621.

The spelling of 804793721 in words is "eight hundred four million, seven hundred ninety-three thousand, seven hundred twenty-one".