3865887 has 14 divisors (see below), whose sum is σ = 5797272. Its totient is φ = 2576772.

The previous prime is 3865877. The next prime is 3865889. The reversal of 3865887 is 7885683.

It is not a de Polignac number, because 3865887 - 2¹⁹ = 3341599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3865889) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 1923 + ... + 3380.

Almost surely, 2^3865887 is an apocalyptic number.

3865887 is a deficient number, since it is larger than the sum of its proper divisors (1931385).

3865887 is an frugal number, since it uses more digits than its factorization.

3865887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5321 (or 5306 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 3865887 is about 1966.1859016889. The cubic root of 3865887 is about 156.9458073608.

The spelling of 3865887 in words is "three million, eight hundred sixty-five thousand, eight hundred eighty-seven".