3939691840 has 112 divisors (see below), whose sum is σ = 10744712064. Its totient is φ = 1347840000.

The previous prime is 3939691837. The next prime is 3939691841. The reversal of 3939691840 is 481969393.

3939691840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3939691841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1210215 + ... + 1213465.

Almost surely, 2^3939691840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3939691840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5372356032).

3939691840 is an abundant number, since it is smaller than the sum of its proper divisors (6805020224).

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

3939691840 is a wasteful number, since it uses less digits than its factorization.

3939691840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3816 (or 3806 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 52.

The square root of 3939691840 is about 62766.9645593922. The cubic root of 3939691840 is about 1579.3828492880.

The spelling of 3939691840 in words is "three billion, nine hundred thirty-nine million, six hundred ninety-one thousand, eight hundred forty".