804004921 has 2 divisors, whose sum is σ = 804004922. Its totient is φ = 804004920.

The previous prime is 804004879. The next prime is 804004937. The reversal of 804004921 is 129400408.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 506925225 + 297079696 = 22515^2 + 17236^2 .

It is a cyclic number.

It is not a de Polignac number, because 804004921 - 2¹³ = 803996729 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 804004921.

It is not a weakly prime, because it can be changed into another prime (804004021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402002460 + 402002461.

It is an arithmetic number, because the mean of its divisors is an integer number (402002461).

Almost surely, 2^804004921 is an apocalyptic number.

It is an amenable number.

804004921 is a deficient number, since it is larger than the sum of its proper divisors (1).

804004921 is an equidigital number, since it uses as much as digits as its factorization.

804004921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 804004921 is about 28354.9805325273. The cubic root of 804004921 is about 929.8642885950.

The spelling of 804004921 in words is "eight hundred four million, four thousand, nine hundred twenty-one".