3981938526 has 108 divisors (see below), whose sum is σ = 9587307912. Its totient is φ = 1194095232.

The previous prime is 3981938501. The next prime is 3981938531. The reversal of 3981938526 is 6258391893.

3981938526 is a `hidden beast` number, since 3 + 9 + 81 + 9 + 38 + 526 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 2751135 + ... + 2752581.

Almost surely, 2^3981938526 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3981938526, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4793653956).

3981938526 is an abundant number, since it is smaller than the sum of its proper divisors (5605369386).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3981938526 is a wasteful number, since it uses less digits than its factorization.

3981938526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1535 (or 1492 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 54.

The square root of 3981938526 is about 63102.6031634195. The cubic root of 3981938526 is about 1585.0082132611.

The spelling of 3981938526 in words is "three billion, nine hundred eighty-one million, nine hundred thirty-eight thousand, five hundred twenty-six".