444821 has 4 divisors (see below), whose sum is σ = 479052. Its totient is φ = 410592.

The previous prime is 444817. The next prime is 444833. The reversal of 444821 is 128444.

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 264196 + 180625 = 514^2 + 425^2 .

It is not a de Polignac number, because 444821 - 2² = 444817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 444821.

It is not an unprimeable number, because it can be changed into a prime (444811) 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, 17096 + ... + 17121.

It is an arithmetic number, because the mean of its divisors is an integer number (119763).

2⁴⁴⁴⁸²¹ is an apocalyptic number.

It is an amenable number.

444821 is a deficient number, since it is larger than the sum of its proper divisors (34231).

444821 is a wasteful number, since it uses less digits than its factorization.

444821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34230.

The product of its digits is 1024, while the sum is 23.

The square root of 444821 is about 666.9490235393. The cubic root of 444821 is about 76.3358291784.

The spelling of 444821 in words is "four hundred forty-four thousand, eight hundred twenty-one".