445820 has 12 divisors (see below), whose sum is σ = 936264. Its totient is φ = 178320.

The previous prime is 445807. The next prime is 445829. The reversal of 445820 is 28544.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 445820.

It is not an unprimeable number, because it can be changed into a prime (445829) by changing a digit.

445820 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11126 + ... + 11165.

It is an arithmetic number, because the mean of its divisors is an integer number (78022).

2⁴⁴⁵⁸²⁰ is an apocalyptic number.

It is an amenable number.

445820 is an abundant number, since it is smaller than the sum of its proper divisors (490444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

445820 is a wasteful number, since it uses less digits than its factorization.

445820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22300 (or 22298 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 445820 is about 667.6975363142. The cubic root of 445820 is about 76.3929326540.

The spelling of 445820 in words is "four hundred forty-five thousand, eight hundred twenty".