805447 has 4 divisors (see below), whose sum is σ = 809856. Its totient is φ = 801040.

The previous prime is 805421. The next prime is 805451. The reversal of 805447 is 744508.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 805447 - 2¹¹ = 803399 is a prime.

It is a Duffinian number.

805447 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (805487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1918 + ... + 2299.

It is an arithmetic number, because the mean of its divisors is an integer number (202464).

2⁸⁰⁵⁴⁴⁷ is an apocalyptic number.

805447 is a deficient number, since it is larger than the sum of its proper divisors (4409).

805447 is a wasteful number, since it uses less digits than its factorization.

805447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4408.

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 805447 is about 897.4669910364. The cubic root of 805447 is about 93.0419897487.

The spelling of 805447 in words is "eight hundred five thousand, four hundred forty-seven".