444337821 has 18 divisors (see below), whose sum is σ = 647126142. Its totient is φ = 293796720.

The previous prime is 444337811. The next prime is 444337841. The reversal of 444337821 is 128733444.

It can be written as a sum of positive squares in only one way, i.e., 439112025 + 5225796 = 20955^2 + 2286^2 .

It is not a de Polignac number, because 444337821 - 2⁷ = 444337693 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (444337811) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 143631 + ... + 146691.

Almost surely, 2^444337821 is an apocalyptic number.

It is an amenable number.

444337821 is a deficient number, since it is larger than the sum of its proper divisors (202788321).

444337821 is a wasteful number, since it uses less digits than its factorization.

444337821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3321 (or 3191 counting only the distinct ones).

The product of its digits is 64512, while the sum is 36.

The square root of 444337821 is about 21079.3221190815. The cubic root of 444337821 is about 763.0817968004.

The spelling of 444337821 in words is "four hundred forty-four million, three hundred thirty-seven thousand, eight hundred twenty-one".