3871815 has 16 divisors (see below), whose sum is σ = 6220800. Its totient is φ = 2056352.

The previous prime is 3871811. The next prime is 3871817. The reversal of 3871815 is 5181783.

3871815 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3871815 - 2² = 3871811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3871811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5026 + ... + 5744.

It is an arithmetic number, because the mean of its divisors is an integer number (388800).

Almost surely, 2^3871815 is an apocalyptic number.

3871815 is a deficient number, since it is larger than the sum of its proper divisors (2348985).

3871815 is a wasteful number, since it uses less digits than its factorization.

3871815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1086.

The product of its digits is 6720, while the sum is 33.

The square root of 3871815 is about 1967.6928113910. The cubic root of 3871815 is about 157.0259872868.

The spelling of 3871815 in words is "three million, eight hundred seventy-one thousand, eight hundred fifteen".