447199821 has 12 divisors (see below), whose sum is σ = 652352220. Its totient is φ = 295180800.

The previous prime is 447199801. The next prime is 447199843. The reversal of 447199821 is 128991744.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 336318921 + 110880900 = 18339^2 + 10530^2 .

It is not a de Polignac number, because 447199821 - 2⁷ = 447199693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (447199801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 245076 + ... + 246893.

It is an arithmetic number, because the mean of its divisors is an integer number (54362685).

Almost surely, 2^447199821 is an apocalyptic number.

It is an amenable number.

447199821 is a deficient number, since it is larger than the sum of its proper divisors (205152399).

447199821 is a wasteful number, since it uses less digits than its factorization.

447199821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492076 (or 492073 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 447199821 is about 21147.0995883596. The cubic root of 447199821 is about 764.7166398966.

The spelling of 447199821 in words is "four hundred forty-seven million, one hundred ninety-nine thousand, eight hundred twenty-one".