444991 has 4 divisors (see below), whose sum is σ = 446400. Its totient is φ = 443584.

The previous prime is 444979. The next prime is 445001. The reversal of 444991 is 199444.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 444991 - 2⁷ = 444863 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 (444901) 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, 15 + ... + 943.

It is an arithmetic number, because the mean of its divisors is an integer number (111600).

2⁴⁴⁴⁹⁹¹ is an apocalyptic number.

444991 is a deficient number, since it is larger than the sum of its proper divisors (1409).

444991 is an equidigital number, since it uses as much as digits as its factorization.

444991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1408.

The product of its digits is 5184, while the sum is 31.

The square root of 444991 is about 667.0764573870. The cubic root of 444991 is about 76.3455525189.

The spelling of 444991 in words is "four hundred forty-four thousand, nine hundred ninety-one".