804043921 has 2 divisors, whose sum is σ = 804043922. Its totient is φ = 804043920.

The previous prime is 804043873. The next prime is 804043949. The reversal of 804043921 is 129340408.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 789329025 + 14714896 = 28095^2 + 3836^2 .

It is a cyclic number.

It is not a de Polignac number, because 804043921 - 2¹¹ = 804041873 is a prime.

It is not a weakly prime, because it can be changed into another prime (804043021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402021960 + 402021961.

It is an arithmetic number, because the mean of its divisors is an integer number (402021961).

Almost surely, 2^804043921 is an apocalyptic number.

It is an amenable number.

804043921 is a deficient number, since it is larger than the sum of its proper divisors (1).

804043921 is an equidigital number, since it uses as much as digits as its factorization.

804043921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 804043921 is about 28355.6682340586. The cubic root of 804043921 is about 929.8793233790.

The spelling of 804043921 in words is "eight hundred four million, forty-three thousand, nine hundred twenty-one".