3978171 has 6 divisors (see below), whose sum is σ = 5746260. Its totient is φ = 2652108.

The previous prime is 3978167. The next prime is 3978179. The reversal of 3978171 is 1718793.

It is not a de Polignac number, because 3978171 - 2² = 3978167 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (3978179) 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, 221001 + ... + 221018.

It is an arithmetic number, because the mean of its divisors is an integer number (957710).

Almost surely, 2^3978171 is an apocalyptic number.

3978171 is a deficient number, since it is larger than the sum of its proper divisors (1768089).

3978171 is a wasteful number, since it uses less digits than its factorization.

3978171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442025 (or 442022 counting only the distinct ones).

The product of its digits is 10584, while the sum is 36.

The square root of 3978171 is about 1994.5352842204. The cubic root of 3978171 is about 158.4508168376.

It can be divided in two parts, 39 and 78171, that added together give a triangular number (78210 = T₃₉₅).

The spelling of 3978171 in words is "three million, nine hundred seventy-eight thousand, one hundred seventy-one".