3971236 has 6 divisors (see below), whose sum is σ = 6949670. Its totient is φ = 1985616.

The previous prime is 3971213. The next prime is 3971239. The reversal of 3971236 is 6321793.

It can be written as a sum of positive squares in only one way, i.e., 2856100 + 1115136 = 1690^2 + 1056^2 .

It is a junction number, because it is equal to n+sod(n) for n = 3971198 and 3971207.

It is not an unprimeable number, because it can be changed into a prime (3971239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496401 + ... + 496408.

Almost surely, 2^3971236 is an apocalyptic number.

It is an amenable number.

3971236 is a deficient number, since it is larger than the sum of its proper divisors (2978434).

3971236 is a wasteful number, since it uses less digits than its factorization.

3971236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 992813 (or 992811 counting only the distinct ones).

The product of its digits is 6804, while the sum is 31.

The square root of 3971236 is about 1992.7960256885. The cubic root of 3971236 is about 158.3586894449.

The spelling of 3971236 in words is "three million, nine hundred seventy-one thousand, two hundred thirty-six".