3944189508639 has 32 divisors (see below), whose sum is σ = 5577429312000. Its totient is φ = 2470716401664.

The previous prime is 3944189508631. The next prime is 3944189508641. The reversal of 3944189508639 is 9368059814493.

3944189508639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3944189508639 - 2³ = 3944189508631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3944189508631) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 100063767 + ... + 100103175.

It is an arithmetic number, because the mean of its divisors is an integer number (174294666000).

Almost surely, 2^{3944189508639} is an apocalyptic number.

3944189508639 is a deficient number, since it is larger than the sum of its proper divisors (1633239803361).

3944189508639 is a wasteful number, since it uses less digits than its factorization.

3944189508639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42607.

The product of its (nonzero) digits is 201553920, while the sum is 69.

The spelling of 3944189508639 in words is "three trillion, nine hundred forty-four billion, one hundred eighty-nine million, five hundred eight thousand, six hundred thirty-nine".