3987885 has 16 divisors (see below), whose sum is σ = 6960960. Its totient is φ = 1933440.

The previous prime is 3987859. The next prime is 3987887. The reversal of 3987885 is 5887893.

It is a happy number.

It is not a de Polignac number, because 3987885 - 2⁶ = 3987821 is a prime.

3987885 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3987887) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11920 + ... + 12249.

It is an arithmetic number, because the mean of its divisors is an integer number (435060).

Almost surely, 2^3987885 is an apocalyptic number.

It is an amenable number.

3987885 is a deficient number, since it is larger than the sum of its proper divisors (2973075).

3987885 is a wasteful number, since it uses less digits than its factorization.

3987885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24188.

The product of its digits is 483840, while the sum is 48.

The square root of 3987885 is about 1996.9689531888. The cubic root of 3987885 is about 158.5796817623.

The spelling of 3987885 in words is "three million, nine hundred eighty-seven thousand, eight hundred eighty-five".