445309 has 4 divisors (see below), whose sum is σ = 449820. Its totient is φ = 440800.

The previous prime is 445307. The next prime is 445321. The reversal of 445309 is 903544.

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 240100 + 205209 = 490^2 + 453^2 .

It is a cyclic number.

It is not a de Polignac number, because 445309 - 2¹ = 445307 is a prime.

It is a Duffinian number.

445309 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (445307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2104 + ... + 2305.

It is an arithmetic number, because the mean of its divisors is an integer number (112455).

2⁴⁴⁵³⁰⁹ is an apocalyptic number.

It is an amenable number.

445309 is a deficient number, since it is larger than the sum of its proper divisors (4511).

445309 is a wasteful number, since it uses less digits than its factorization.

445309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4510.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 445309 is about 667.3147683065. The cubic root of 445309 is about 76.3637342385.

The spelling of 445309 in words is "four hundred forty-five thousand, three hundred nine".