3871986 has 16 divisors (see below), whose sum is σ = 7776000. Its totient is φ = 1285328.

The previous prime is 3871969. The next prime is 3872017. The reversal of 3871986 is 6891783.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 415 + ... + 2813.

It is an arithmetic number, because the mean of its divisors is an integer number (486000).

Almost surely, 2^3871986 is an apocalyptic number.

3871986 is an abundant number, since it is smaller than the sum of its proper divisors (3904014).

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

3871986 is a wasteful number, since it uses less digits than its factorization.

3871986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2673.

The product of its digits is 72576, while the sum is 42.

The square root of 3871986 is about 1967.7362628157. The cubic root of 3871986 is about 157.0282989545.

The spelling of 3871986 in words is "three million, eight hundred seventy-one thousand, nine hundred eighty-six".