444639 has 12 divisors (see below), whose sum is σ = 642696. Its totient is φ = 273312.

The previous prime is 444637. The next prime is 444641. The reversal of 444639 is 936444.

It is an interprime number because it is at equal distance from previous prime (444637) and next prime (444641).

It is not a de Polignac number, because 444639 - 2¹ = 444637 is a prime.

444639 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (444637) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69 + ... + 945.

It is an arithmetic number, because the mean of its divisors is an integer number (53558).

2⁴⁴⁴⁶³⁹ is an apocalyptic number.

444639 is a deficient number, since it is larger than the sum of its proper divisors (198057).

444639 is a wasteful number, since it uses less digits than its factorization.

444639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906 (or 893 counting only the distinct ones).

The product of its digits is 10368, while the sum is 30.

The square root of 444639 is about 666.8125673681. The cubic root of 444639 is about 76.3254167382.

The spelling of 444639 in words is "four hundred forty-four thousand, six hundred thirty-nine".