3971385 has 48 divisors (see below), whose sum is σ = 7682688. Its totient is φ = 1881600.

The previous prime is 3971377. The next prime is 3971393. The reversal of 3971385 is 5831793.

It is an interprime number because it is at equal distance from previous prime (3971377) and next prime (3971393).

It is not a de Polignac number, because 3971385 - 2³ = 3971377 is a prime.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 35089 + ... + 35201.

It is an arithmetic number, because the mean of its divisors is an integer number (160056).

Almost surely, 2^3971385 is an apocalyptic number.

It is an amenable number.

3971385 is a deficient number, since it is larger than the sum of its proper divisors (3711303).

3971385 is a wasteful number, since it uses less digits than its factorization.

3971385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206 (or 203 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 3971385 is about 1992.8334099969. The cubic root of 3971385 is about 158.3606699491.

It can be divided in two parts, 3971 and 385, that added together give a square (4356 = 66²).

The spelling of 3971385 in words is "three million, nine hundred seventy-one thousand, three hundred eighty-five".