3971128 has 16 divisors (see below), whose sum is σ = 8509680. Its totient is φ = 1701888.

The previous prime is 3971119. The next prime is 3971129. The reversal of 3971128 is 8211793.

It is a self number, because there is not a number n which added to its sum of digits gives 3971128.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3971129) 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, 35401 + ... + 35512.

It is an arithmetic number, because the mean of its divisors is an integer number (531855).

Almost surely, 2^3971128 is an apocalyptic number.

It is an amenable number.

3971128 is an abundant number, since it is smaller than the sum of its proper divisors (4538552).

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

3971128 is a wasteful number, since it uses less digits than its factorization.

3971128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70926 (or 70922 counting only the distinct ones).

The product of its digits is 3024, while the sum is 31.

The square root of 3971128 is about 1992.7689278991. The cubic root of 3971128 is about 158.3572538806.

The spelling of 3971128 in words is "three million, nine hundred seventy-one thousand, one hundred twenty-eight".