445665 has 32 divisors (see below), whose sum is σ = 809856. Its totient is φ = 207360.

The previous prime is 445657. The next prime is 445691. The reversal of 445665 is 566544.

It is not a de Polignac number, because 445665 - 2³ = 445657 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

445665 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6069 + ... + 6141.

It is an arithmetic number, because the mean of its divisors is an integer number (25308).

2⁴⁴⁵⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

445665 is a deficient number, since it is larger than the sum of its proper divisors (364191).

445665 is a wasteful number, since it uses less digits than its factorization.

445665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129.

The product of its digits is 14400, while the sum is 30.

The square root of 445665 is about 667.5814557041. The cubic root of 445665 is about 76.3840783503.

The spelling of 445665 in words is "four hundred forty-five thousand, six hundred sixty-five".