3939728 has 60 divisors (see below), whose sum is σ = 8713728. Its totient is φ = 1722240.

The previous prime is 3939721. The next prime is 3939743. The reversal of 3939728 is 8279393.

Its product of digits (81648) is a multiple of the sum of its prime factors (112).

It is not an unprimeable number, because it can be changed into a prime (3939721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83801 + ... + 83847.

Almost surely, 2^3939728 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 3939728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4356864).

3939728 is an abundant number, since it is smaller than the sum of its proper divisors (4774000).

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

3939728 is a wasteful number, since it uses less digits than its factorization.

3939728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112 (or 93 counting only the distinct ones).

The product of its digits is 81648, while the sum is 41.

The square root of 3939728 is about 1984.8748071352. The cubic root of 3939728 is about 157.9387681333.

The spelling of 3939728 in words is "three million, nine hundred thirty-nine thousand, seven hundred twenty-eight".