3872865 has 32 divisors (see below), whose sum is σ = 6635520. Its totient is φ = 1923264.

The previous prime is 3872851. The next prime is 3872873. The reversal of 3872865 is 5682783.

It is not a de Polignac number, because 3872865 - 2⁵ = 3872833 is a prime.

3872865 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30432 + ... + 30558.

It is an arithmetic number, because the mean of its divisors is an integer number (207360).

Almost surely, 2^3872865 is an apocalyptic number.

It is an amenable number.

3872865 is a deficient number, since it is larger than the sum of its proper divisors (2762655).

3872865 is a wasteful number, since it uses less digits than its factorization.

3872865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261.

The product of its digits is 80640, while the sum is 39.

The square root of 3872865 is about 1967.9596032439. The cubic root of 3872865 is about 157.0401806633.

The spelling of 3872865 in words is "three million, eight hundred seventy-two thousand, eight hundred sixty-five".