3917889639 has 48 divisors (see below), whose sum is σ = 5845292544. Its totient is φ = 2527848000.

The previous prime is 3917889611. The next prime is 3917889721. The reversal of 3917889639 is 9369887193.

It is not a de Polignac number, because 3917889639 - 2¹¹ = 3917887591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3917889539) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13843992 + ... + 13844274.

It is an arithmetic number, because the mean of its divisors is an integer number (121776928).

Almost surely, 2^3917889639 is an apocalyptic number.

3917889639 is a deficient number, since it is larger than the sum of its proper divisors (1927402905).

3917889639 is a wasteful number, since it uses less digits than its factorization.

3917889639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668 (or 665 counting only the distinct ones).

The product of its digits is 17635968, while the sum is 63.

The square root of 3917889639 is about 62593.0478487827. The cubic root of 3917889639 is about 1576.4640306863.

The spelling of 3917889639 in words is "three billion, nine hundred seventeen million, eight hundred eighty-nine thousand, six hundred thirty-nine".