809447 has 2 divisors, whose sum is σ = 809448. Its totient is φ = 809446.

The previous prime is 809443. The next prime is 809453. The reversal of 809447 is 744908.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 809447 - 2² = 809443 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 809447.

It is not a weakly prime, because it can be changed into another prime (809443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404723 + 404724.

It is an arithmetic number, because the mean of its divisors is an integer number (404724).

2⁸⁰⁹⁴⁴⁷ is an apocalyptic number.

809447 is a deficient number, since it is larger than the sum of its proper divisors (1).

809447 is an equidigital number, since it uses as much as digits as its factorization.

809447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 809447 is about 899.6927253235. The cubic root of 809447 is about 93.1957567742.

The spelling of 809447 in words is "eight hundred nine thousand, four hundred forty-seven".