443624221 has 4 divisors (see below), whose sum is σ = 446862492. Its totient is φ = 440385952.

The previous prime is 443624213. The next prime is 443624227. The reversal of 443624221 is 122426344.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 379704196 + 63920025 = 19486^2 + 7995^2 .

It is not a de Polignac number, because 443624221 - 2³ = 443624213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 443624221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (443624227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1618930 + ... + 1619203.

It is an arithmetic number, because the mean of its divisors is an integer number (111715623).

Almost surely, 2^443624221 is an apocalyptic number.

It is an amenable number.

443624221 is a deficient number, since it is larger than the sum of its proper divisors (3238271).

443624221 is a wasteful number, since it uses less digits than its factorization.

443624221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3238270.

The product of its digits is 9216, while the sum is 28.

The square root of 443624221 is about 21062.3887771544. The cubic root of 443624221 is about 762.6730785459.

The spelling of 443624221 in words is "four hundred forty-three million, six hundred twenty-four thousand, two hundred twenty-one".