3999985 has 8 divisors (see below), whose sum is σ = 5236416. Its totient is φ = 2909040.

The previous prime is 3999971. The next prime is 4000037. The reversal of 3999985 is 5899993.

3999985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3999985 - 2²¹ = 1902833 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 36309 + ... + 36418.

It is an arithmetic number, because the mean of its divisors is an integer number (654552).

Almost surely, 2^3999985 is an apocalyptic number.

It is an amenable number.

3999985 is a deficient number, since it is larger than the sum of its proper divisors (1236431).

3999985 is a wasteful number, since it uses less digits than its factorization.

3999985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72743.

The product of its digits is 787320, while the sum is 52.

The square root of 3999985 is about 1999.9962499965. The cubic root of 3999985 is about 158.7399067714.

The spelling of 3999985 in words is "three million, nine hundred ninety-nine thousand, nine hundred eighty-five".