3971985 has 32 divisors (see below), whose sum is σ = 6877440. Its totient is φ = 1951488.

The previous prime is 3971983. The next prime is 3971993. The reversal of 3971985 is 5891793.

It is a happy number.

It is not a de Polignac number, because 3971985 - 2¹ = 3971983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3971983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9807 + ... + 10203.

It is an arithmetic number, because the mean of its divisors is an integer number (214920).

Almost surely, 2^3971985 is an apocalyptic number.

It is an amenable number.

3971985 is a deficient number, since it is larger than the sum of its proper divisors (2905455).

3971985 is a wasteful number, since it uses less digits than its factorization.

3971985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457.

The product of its digits is 68040, while the sum is 42.

The square root of 3971985 is about 1992.9839437386. The cubic root of 3971985 is about 158.3686446328.

The spelling of 3971985 in words is "three million, nine hundred seventy-one thousand, nine hundred eighty-five".