3999849 has 16 divisors (see below), whose sum is σ = 6174720. Its totient is φ = 2255760.

The previous prime is 3999803. The next prime is 3999851. The reversal of 3999849 is 9489993.

It is not a de Polignac number, because 3999849 - 2⁹ = 3999337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3999859) 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, 454 + ... + 2864.

It is an arithmetic number, because the mean of its divisors is an integer number (385920).

Almost surely, 2^3999849 is an apocalyptic number.

It is an amenable number.

3999849 is a deficient number, since it is larger than the sum of its proper divisors (2174871).

3999849 is a wasteful number, since it uses less digits than its factorization.

3999849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2500.

The product of its digits is 629856, while the sum is 51.

The square root of 3999849 is about 1999.9622496437. The cubic root of 3999849 is about 158.7381076920.

It can be divided in two parts, 399984 and 9, that added together give a palindrome (399993).

The spelling of 3999849 in words is "three million, nine hundred ninety-nine thousand, eight hundred forty-nine".