3987775 has 24 divisors (see below), whose sum is σ = 5718384. Its totient is φ = 2726400.

The previous prime is 3987769. The next prime is 3987791. The reversal of 3987775 is 5777893.

It is a happy number.

It is not a de Polignac number, because 3987775 - 2¹⁷ = 3856703 is a prime.

It is a Duffinian number.

3987775 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4249 + ... + 5101.

It is an arithmetic number, because the mean of its divisors is an integer number (238266).

Almost surely, 2^3987775 is an apocalyptic number.

3987775 is a deficient number, since it is larger than the sum of its proper divisors (1730609).

3987775 is a wasteful number, since it uses less digits than its factorization.

3987775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891 (or 886 counting only the distinct ones).

The product of its digits is 370440, while the sum is 46.

The square root of 3987775 is about 1996.9414112587. The cubic root of 3987775 is about 158.5782236857.

The spelling of 3987775 in words is "three million, nine hundred eighty-seven thousand, seven hundred seventy-five".