3970728 has 64 divisors (see below), whose sum is σ = 11404800. Its totient is φ = 1278720.

The previous prime is 3970723. The next prime is 3970739. The reversal of 3970728 is 8270793.

3970728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

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

It is a junction number, because it is equal to n+sod(n) for n = 3970692 and 3970701.

It is not an unprimeable number, because it can be changed into a prime (3970723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6400 + ... + 6992.

It is an arithmetic number, because the mean of its divisors is an integer number (178200).

Almost surely, 2^3970728 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 3970728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5702400).

3970728 is an abundant number, since it is smaller than the sum of its proper divisors (7434072).

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

3970728 is a wasteful number, since it uses less digits than its factorization.

3970728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639 (or 629 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 3970728 is about 1992.6685625061. The cubic root of 3970728 is about 158.3519367492.

The spelling of 3970728 in words is "three million, nine hundred seventy thousand, seven hundred twenty-eight".