3991886 has 8 divisors (see below), whose sum is σ = 6009984. Its totient is φ = 1988560.

The previous prime is 3991877. The next prime is 3991891. The reversal of 3991886 is 6881993.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2990 + ... + 4113.

It is an arithmetic number, because the mean of its divisors is an integer number (751248).

Almost surely, 2^3991886 is an apocalyptic number.

3991886 is a deficient number, since it is larger than the sum of its proper divisors (2018098).

3991886 is a wasteful number, since it uses less digits than its factorization.

3991886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7386.

The product of its digits is 93312, while the sum is 44.

The square root of 3991886 is about 1997.9704702523. The cubic root of 3991886 is about 158.6326977709.

It can be divided in two parts, 39918 and 86, that added together give a palindrome (40004).

The spelling of 3991886 in words is "three million, nine hundred ninety-one thousand, eight hundred eighty-six".