1639443 has 16 divisors (see below), whose sum is σ = 2379776. Its totient is φ = 997920.

The previous prime is 1639427. The next prime is 1639459. The reversal of 1639443 is 3449361.

1639443 is nontrivially palindromic in base 2.

It is an interprime number because it is at equal distance from previous prime (1639427) and next prime (1639459).

It is not a de Polignac number, because 1639443 - 2⁴ = 1639427 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 1639443.

It is not an unprimeable number, because it can be changed into a prime (1639493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4788 + ... + 5118.

It is an arithmetic number, because the mean of its divisors is an integer number (148736).

2^1639443 is an apocalyptic number.

1639443 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1639443 is a deficient number, since it is larger than the sum of its proper divisors (740333).

1639443 is a wasteful number, since it uses less digits than its factorization.

1639443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474.

The product of its digits is 7776, while the sum is 30.

The square root of 1639443 is about 1280.4073570548. The cubic root of 1639443 is about 117.9140185670.

The spelling of 1639443 in words is "one million, six hundred thirty-nine thousand, four hundred forty-three".