3889865 has 12 divisors (see below), whose sum is σ = 5430276. Its totient is φ = 2667168.

The previous prime is 3889859. The next prime is 3889867. The reversal of 3889865 is 5689883.

It can be written as a sum of positive squares in 2 ways, for example, as 3087049 + 802816 = 1757^2 + 896^2 .

It is not a de Polignac number, because 3889865 - 2⁶ = 3889801 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a d-powerful number, because it can be written as 3⁷ + 8 + 8⁵ + 9 + 8⁷ + 6⁸ + 5⁷ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3889867) 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 11 ways as a sum of consecutive naturals, for example, 7694 + ... + 8183.

It is an arithmetic number, because the mean of its divisors is an integer number (452523).

Almost surely, 2^3889865 is an apocalyptic number.

3889865 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3889865 is a deficient number, since it is larger than the sum of its proper divisors (1540411).

3889865 is a wasteful number, since it uses less digits than its factorization.

3889865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15896 (or 15889 counting only the distinct ones).

The product of its digits is 414720, while the sum is 47.

The square root of 3889865 is about 1972.2740681761. The cubic root of 3889865 is about 157.2696220342.

The spelling of 3889865 in words is "three million, eight hundred eighty-nine thousand, eight hundred sixty-five".