3899985 has 16 divisors (see below), whose sum is σ = 6409536. Its totient is φ = 2023488.

The previous prime is 3899983. The next prime is 3899989. The reversal of 3899985 is 5899983.

It is not a de Polignac number, because 3899985 - 2¹ = 3899983 is a prime.

It is a Curzon number.

3899985 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3899981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2959 + ... + 4068.

It is an arithmetic number, because the mean of its divisors is an integer number (400596).

Almost surely, 2^3899985 is an apocalyptic number.

It is an amenable number.

3899985 is a deficient number, since it is larger than the sum of its proper divisors (2509551).

3899985 is a wasteful number, since it uses less digits than its factorization.

3899985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7072.

The product of its digits is 699840, while the sum is 51.

The square root of 3899985 is about 1974.8379680369. The cubic root of 3899985 is about 157.4058898602.

It can be divided in two parts, 3899 and 985, that added together give a palindrome (4884).

The spelling of 3899985 in words is "three million, eight hundred ninety-nine thousand, nine hundred eighty-five".