3939393920 has 128 divisors (see below), whose sum is σ = 11741587200. Its totient is φ = 1227847680.

The previous prime is 3939393919. The next prime is 3939393979. The reversal of 3939393920 is 293939393.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9311 + ... + 89249.

It is an arithmetic number, because the mean of its divisors is an integer number (91731150).

Almost surely, 2^3939393920 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 3939393920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5870793600).

3939393920 is an abundant number, since it is smaller than the sum of its proper divisors (7802193280).

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

3939393920 is a wasteful number, since it uses less digits than its factorization.

3939393920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79976 (or 79964 counting only the distinct ones).

The product of its (nonzero) digits is 1062882, while the sum is 50.

The square root of 3939393920 is about 62764.5912915873. The cubic root of 3939393920 is about 1579.3430372402.

The spelling of 3939393920 in words is "three billion, nine hundred thirty-nine million, three hundred ninety-three thousand, nine hundred twenty".