804404989 has 2 divisors, whose sum is σ = 804404990. Its totient is φ = 804404988.

The previous prime is 804404983. The next prime is 804405011. The reversal of 804404989 is 989404408.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 799192900 + 5212089 = 28270^2 + 2283^2 .

It is a cyclic number.

It is not a de Polignac number, because 804404989 - 2³ = 804404981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (804404981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402202494 + 402202495.

It is an arithmetic number, because the mean of its divisors is an integer number (402202495).

Almost surely, 2^804404989 is an apocalyptic number.

It is an amenable number.

804404989 is a deficient number, since it is larger than the sum of its proper divisors (1).

804404989 is an equidigital number, since it uses as much as digits as its factorization.

804404989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 331776, while the sum is 46.

The square root of 804404989 is about 28362.0342888164. The cubic root of 804404989 is about 930.0184946413.

The spelling of 804404989 in words is "eight hundred four million, four hundred four thousand, nine hundred eighty-nine".