3929643220 has 12 divisors (see below), whose sum is σ = 8252250804. Its totient is φ = 1571857280.

The previous prime is 3929643187. The next prime is 3929643227. The reversal of 3929643220 is 223469293.

3929643220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 479960464 + 3449682756 = 21908^2 + 58734^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3929643227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98241061 + ... + 98241100.

It is an arithmetic number, because the mean of its divisors is an integer number (687687567).

Almost surely, 2^3929643220 is an apocalyptic number.

It is an amenable number.

3929643220 is an abundant number, since it is smaller than the sum of its proper divisors (4322607584).

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

3929643220 is a wasteful number, since it uses less digits than its factorization.

3929643220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196482170 (or 196482168 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 40.

The square root of 3929643220 is about 62686.8664075658. The cubic root of 3929643220 is about 1578.0389091068.

The spelling of 3929643220 in words is "three billion, nine hundred twenty-nine million, six hundred forty-three thousand, two hundred twenty".