3999684 has 24 divisors (see below), whose sum is σ = 10050880. Its totient is φ = 1230624.

The previous prime is 3999683. The next prime is 3999703. The reversal of 3999684 is 4869993.

It is a happy number.

3999684 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (3999683) 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 7 ways as a sum of consecutive naturals, for example, 12664 + ... + 12975.

Almost surely, 2^3999684 is an apocalyptic number.

It is an amenable number.

3999684 is an abundant number, since it is smaller than the sum of its proper divisors (6051196).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3999684 is a wasteful number, since it uses less digits than its factorization.

3999684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25659 (or 25657 counting only the distinct ones).

The product of its digits is 419904, while the sum is 48.

The square root of 3999684 is about 1999.9209984397. The cubic root of 3999684 is about 158.7359249306.

The spelling of 3999684 in words is "three million, nine hundred ninety-nine thousand, six hundred eighty-four".