444635221 has 16 divisors (see below), whose sum is σ = 490374000. Its totient is φ = 401271808.

The previous prime is 444635159. The next prime is 444635231. The reversal of 444635221 is 122536444.

It can be written as a sum of positive squares in 8 ways, for example, as 42432196 + 402203025 = 6514^2 + 20055^2 .

It is a de Polignac number, because none of the positive numbers 2^k-444635221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (444635231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70431 + ... + 76483.

It is an arithmetic number, because the mean of its divisors is an integer number (30648375).

Almost surely, 2^444635221 is an apocalyptic number.

It is an amenable number.

444635221 is a deficient number, since it is larger than the sum of its proper divisors (45738779).

444635221 is a wasteful number, since it uses less digits than its factorization.

444635221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6248.

The product of its digits is 23040, while the sum is 31.

The square root of 444635221 is about 21086.3752456414. The cubic root of 444635221 is about 763.2520050693.

The spelling of 444635221 in words is "four hundred forty-four million, six hundred thirty-five thousand, two hundred twenty-one".