3943728 has 100 divisors (see below), whose sum is σ = 12153240. Its totient is φ = 1230336.

The previous prime is 3943721. The next prime is 3943757. The reversal of 3943728 is 8273493.

It is a Harshad number since it is a multiple of its sum of digits (36).

Its product of digits (36288) is a multiple of the sum of its prime factors (216).

It is a junction number, because it is equal to n+sod(n) for n = 3943692 and 3943701.

It is not an unprimeable number, because it can be changed into a prime (3943721) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 21943 + ... + 22121.

Almost surely, 2^3943728 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 3943728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6076620).

3943728 is an abundant number, since it is smaller than the sum of its proper divisors (8209512).

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

3943728 is a wasteful number, since it uses less digits than its factorization.

3943728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216 (or 201 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 3943728 is about 1985.8821717312. The cubic root of 3943728 is about 157.9922017195.

The spelling of 3943728 in words is "three million, nine hundred forty-three thousand, seven hundred twenty-eight".