3879865 has 20 divisors (see below), whose sum is σ = 5218020. Its totient is φ = 2768480.

The previous prime is 3879853. The next prime is 3879913. The reversal of 3879865 is 5689783.

It can be written as a sum of positive squares in 2 ways, for example, as 2108304 + 1771561 = 1452^2 + 1331^2 .

It is not a de Polignac number, because 3879865 - 2⁷ = 3879737 is a prime.

3879865 is a lucky number.

It is a nialpdrome in base 11.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 73179 + ... + 73231.

It is an arithmetic number, because the mean of its divisors is an integer number (260901).

Almost surely, 2^3879865 is an apocalyptic number.

It is an amenable number.

3879865 is a deficient number, since it is larger than the sum of its proper divisors (1338155).

3879865 is an frugal number, since it uses more digits than its factorization.

3879865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102 (or 69 counting only the distinct ones).

The product of its digits is 362880, while the sum is 46.

The square root of 3879865 is about 1969.7372921281. The cubic root of 3879865 is about 157.1347376757.

The spelling of 3879865 in words is "three million, eight hundred seventy-nine thousand, eight hundred sixty-five".