445809 has 32 divisors (see below), whose sum is σ = 774144. Its totient is φ = 221760.

The previous prime is 445807. The next prime is 445829. The reversal of 445809 is 908544.

445809 = T₂₂ + T₂₃ + ... + T₁₃₈.

It is not a de Polignac number, because 445809 - 2¹ = 445807 is a prime.

445809 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (445807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6244 + ... + 6314.

It is an arithmetic number, because the mean of its divisors is an integer number (24192).

2⁴⁴⁵⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

445809 is a deficient number, since it is larger than the sum of its proper divisors (328335).

445809 is a wasteful number, since it uses less digits than its factorization.

445809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 445809 is about 667.6892990007. The cubic root of 445809 is about 76.3923043517.

The spelling of 445809 in words is "four hundred forty-five thousand, eight hundred nine".