3981887 has 32 divisors (see below), whose sum is σ = 5376000. Its totient is φ = 2921184.

The previous prime is 3981883. The next prime is 3981889. The reversal of 3981887 is 7881893.

It is not a de Polignac number, because 3981887 - 2² = 3981883 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3981881) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 84698 + ... + 84744.

It is an arithmetic number, because the mean of its divisors is an integer number (168000).

Almost surely, 2^3981887 is an apocalyptic number.

3981887 is a deficient number, since it is larger than the sum of its proper divisors (1394113).

3981887 is a wasteful number, since it uses less digits than its factorization.

3981887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100 (or 86 counting only the distinct ones).

The product of its digits is 96768, while the sum is 44.

The square root of 3981887 is about 1995.4666120985. The cubic root of 3981887 is about 158.5001376601.

The spelling of 3981887 in words is "three million, nine hundred eighty-one thousand, eight hundred eighty-seven".