3971156 has 18 divisors (see below), whose sum is σ = 8084538. Its totient is φ = 1701840.

The previous prime is 3971153. The next prime is 3971167. The reversal of 3971156 is 6511793.

It can be written as a sum of positive squares in only one way, i.e., 2202256 + 1768900 = 1484^2 + 1330^2 .

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3971153) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9935 + ... + 10326.

It is an arithmetic number, because the mean of its divisors is an integer number (449141).

Almost surely, 2^3971156 is an apocalyptic number.

It is an amenable number.

3971156 is an abundant number, since it is smaller than the sum of its proper divisors (4113382).

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

3971156 is a wasteful number, since it uses less digits than its factorization.

3971156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20279 (or 20270 counting only the distinct ones).

The product of its digits is 5670, while the sum is 32.

The square root of 3971156 is about 1992.7759532873. The cubic root of 3971156 is about 158.3576260664.

The spelling of 3971156 in words is "three million, nine hundred seventy-one thousand, one hundred fifty-six".