3985815 has 16 divisors (see below), whose sum is σ = 6533856. Its totient is φ = 2073600.

The previous prime is 3985777. The next prime is 3985829. The reversal of 3985815 is 5185893.

It is not a de Polignac number, because 3985815 - 2¹⁰ = 3984791 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2626 + ... + 3855.

It is an arithmetic number, because the mean of its divisors is an integer number (408366).

Almost surely, 2^3985815 is an apocalyptic number.

3985815 is a deficient number, since it is larger than the sum of its proper divisors (2548041).

3985815 is a wasteful number, since it uses less digits than its factorization.

3985815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6530.

The product of its digits is 43200, while the sum is 39.

The square root of 3985815 is about 1996.4506004407. The cubic root of 3985815 is about 158.5522389152.

The spelling of 3985815 in words is "three million, nine hundred eighty-five thousand, eight hundred fifteen".