445401220 has 24 divisors (see below), whose sum is σ = 1020374208. Its totient is φ = 161964000.

The previous prime is 445401217. The next prime is 445401221. The reversal of 445401220 is 22104544.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 445401191 and 445401200.

It is not an unprimeable number, because it can be changed into a prime (445401221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1012056 + ... + 1012495.

It is an arithmetic number, because the mean of its divisors is an integer number (42515592).

Almost surely, 2^445401220 is an apocalyptic number.

It is an amenable number.

445401220 is an abundant number, since it is smaller than the sum of its proper divisors (574972988).

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

445401220 is a wasteful number, since it uses less digits than its factorization.

445401220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2024571 (or 2024569 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 445401220 is about 21104.5307931733. The cubic root of 445401220 is about 763.6900531807.

Adding to 445401220 its reverse (22104544), we get a palindrome (467505764).

The spelling of 445401220 in words is "four hundred forty-five million, four hundred one thousand, two hundred twenty".