445909 has 4 divisors (see below), whose sum is σ = 450604. Its totient is φ = 441216.

The previous prime is 445891. The next prime is 445931. The reversal of 445909 is 909544.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 103684 + 342225 = 322^2 + 585^2 .

It is a cyclic number.

It is not a de Polignac number, because 445909 - 2⁵ = 445877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (445969) 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, 2202 + ... + 2395.

It is an arithmetic number, because the mean of its divisors is an integer number (112651).

2⁴⁴⁵⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

445909 is a deficient number, since it is larger than the sum of its proper divisors (4695).

445909 is an equidigital number, since it uses as much as digits as its factorization.

445909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4694.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 445909 is about 667.7641799318. The cubic root of 445909 is about 76.3980158106.

The spelling of 445909 in words is "four hundred forty-five thousand, nine hundred nine".