3971986 has 8 divisors (see below), whose sum is σ = 5967360. Its totient is φ = 1982868.

The previous prime is 3971983. The next prime is 3971993. The reversal of 3971986 is 6891793.

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 655 + ... + 2893.

It is an arithmetic number, because the mean of its divisors is an integer number (745920).

Almost surely, 2^3971986 is an apocalyptic number.

3971986 is a deficient number, since it is larger than the sum of its proper divisors (1995374).

3971986 is a wasteful number, since it uses less digits than its factorization.

3971986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3128.

The product of its digits is 81648, while the sum is 43.

The square root of 3971986 is about 1992.9841946187. The cubic root of 3971986 is about 158.3686579233.

The spelling of 3971986 in words is "three million, nine hundred seventy-one thousand, nine hundred eighty-six".