804409 has 2 divisors, whose sum is σ = 804410. Its totient is φ = 804408.

The previous prime is 804383. The next prime is 804443. The reversal of 804409 is 904408.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 525625 + 278784 = 725^2 + 528^2 .

It is a cyclic number.

It is not a de Polignac number, because 804409 - 2⁷ = 804281 is a prime.

It is not a weakly prime, because it can be changed into another prime (804449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402204 + 402205.

It is an arithmetic number, because the mean of its divisors is an integer number (402205).

2⁸⁰⁴⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

804409 is a deficient number, since it is larger than the sum of its proper divisors (1).

804409 is an equidigital number, since it uses as much as digits as its factorization.

804409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 804409 is about 896.8885103512. Note that the first 3 decimals coincide. The cubic root of 804409 is about 93.0020040421.

Subtracting 804409 from its reverse (904408), we obtain a palindrome (99999).

It can be divided in two parts, 80 and 4409, that added together give a square (4489 = 67²).

The spelling of 804409 in words is "eight hundred four thousand, four hundred nine".