3864987 has 24 divisors (see below), whose sum is σ = 6589440. Its totient is φ = 2136240.

The previous prime is 3864979. The next prime is 3865007. The reversal of 3864987 is 7894683.

It is a happy number.

It is not a de Polignac number, because 3864987 - 2³ = 3864979 is a prime.

3864987 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3864977) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 964 + ... + 2942.

It is an arithmetic number, because the mean of its divisors is an integer number (274560).

Almost surely, 2^3864987 is an apocalyptic number.

3864987 is a deficient number, since it is larger than the sum of its proper divisors (2724453).

3864987 is a wasteful number, since it uses less digits than its factorization.

3864987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2023 (or 2020 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 3864987 is about 1965.9570188588. The cubic root of 3864987 is about 156.9336271298.

It can be divided in two parts, 3864 and 987, that added together give a triangular number (4851 = T₉₈).

The spelling of 3864987 in words is "three million, eight hundred sixty-four thousand, nine hundred eighty-seven".