3971872 has 12 divisors (see below), whose sum is σ = 7819686. Its totient is φ = 1985920.

The previous prime is 3971861. The next prime is 3971879. The reversal of 3971872 is 2781793.

It can be written as a sum of positive squares in only one way, i.e., 3400336 + 571536 = 1844^2 + 756^2 .

It is not an unprimeable number, because it can be changed into a prime (3971879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62029 + ... + 62092.

Almost surely, 2^3971872 is an apocalyptic number.

3971872 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

3971872 is a deficient number, since it is larger than the sum of its proper divisors (3847814).

3971872 is a wasteful number, since it uses less digits than its factorization.

3971872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124131 (or 124123 counting only the distinct ones).

The product of its digits is 21168, while the sum is 37.

The square root of 3971872 is about 1992.9555940863. The cubic root of 3971872 is about 158.3671427954.

The spelling of 3971872 in words is "three million, nine hundred seventy-one thousand, eight hundred seventy-two".