1644642382 has 32 divisors (see below), whose sum is σ = 2536934400. Its totient is φ = 799437600.

The previous prime is 1644642317. The next prime is 1644642397. The reversal of 1644642382 is 2832464461.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 3746119 + ... + 3746557.

It is an arithmetic number, because the mean of its divisors is an integer number (79279200).

Almost surely, 2^1644642382 is an apocalyptic number.

1644642382 is a deficient number, since it is larger than the sum of its proper divisors (892292018).

1644642382 is a wasteful number, since it uses less digits than its factorization.

1644642382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832.

The product of its digits is 221184, while the sum is 40.

The square root of 1644642382 is about 40554.1906835779. The cubic root of 1644642382 is about 1180.3853912093.

The spelling of 1644642382 in words is "one billion, six hundred forty-four million, six hundred forty-two thousand, three hundred eighty-two".