1444639 has 8 divisors (see below), whose sum is σ = 1686528. Its totient is φ = 1211640.

The previous prime is 1444633. The next prime is 1444649. The reversal of 1444639 is 9364441.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1444639 - 2¹¹ = 1442591 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1444639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1444633) 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 7 ways as a sum of consecutive naturals, for example, 1867 + ... + 2524.

It is an arithmetic number, because the mean of its divisors is an integer number (210816).

2^1444639 is an apocalyptic number.

1444639 is a deficient number, since it is larger than the sum of its proper divisors (241889).

1444639 is an equidigital number, since it uses as much as digits as its factorization.

1444639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4445.

The product of its digits is 10368, while the sum is 31.

The square root of 1444639 is about 1201.9313624330. The cubic root of 1444639 is about 113.0454564292.

The spelling of 1444639 in words is "one million, four hundred forty-four thousand, six hundred thirty-nine".