445421220 has 48 divisors (see below), whose sum is σ = 1301408640. Its totient is φ = 113614336.

The previous prime is 445421213. The next prime is 445421227. The reversal of 445421220 is 22124544.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (445421213) and next prime (445421227).

It is not an unprimeable number, because it can be changed into a prime (445421227) 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 15 ways as a sum of consecutive naturals, for example, 160005 + ... + 162764.

It is an arithmetic number, because the mean of its divisors is an integer number (27112680).

Almost surely, 2^445421220 is an apocalyptic number.

It is an amenable number.

445421220 is an abundant number, since it is smaller than the sum of its proper divisors (855987420).

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

445421220 is a wasteful number, since it uses less digits than its factorization.

445421220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322804 (or 322802 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 24.

The square root of 445421220 is about 21105.0046197578. The cubic root of 445421220 is about 763.7014837530.

Adding to 445421220 its reverse (22124544), we get a palindrome (467545764).

The spelling of 445421220 in words is "four hundred forty-five million, four hundred twenty-one thousand, two hundred twenty".