445009 has 4 divisors (see below), whose sum is σ = 471204. Its totient is φ = 418816.

The previous prime is 445001. The next prime is 445019. The reversal of 445009 is 900544.

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 394384 + 50625 = 628^2 + 225^2 .

It is a cyclic number.

It is not a de Polignac number, because 445009 - 2³ = 445001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (445001) 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, 13072 + ... + 13105.

It is an arithmetic number, because the mean of its divisors is an integer number (117801).

2⁴⁴⁵⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

445009 is a deficient number, since it is larger than the sum of its proper divisors (26195).

445009 is a wasteful number, since it uses less digits than its factorization.

445009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26194.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 445009 is about 667.0899489574. The cubic root of 445009 is about 76.3465819040.

Subtracting 445009 from its reverse (900544), we obtain a triangular number (455535 = T₉₅₄).

The spelling of 445009 in words is "four hundred forty-five thousand, nine".