3996639 has 12 divisors (see below), whose sum is σ = 5914272. Its totient is φ = 2599200.

The previous prime is 3996589. The next prime is 3996647. The reversal of 3996639 is 9366993.

3996639 is a `hidden beast` number, since 3 + 9 + 9 + 6 + 639 = 666.

It is not a de Polignac number, because 3996639 - 2⁷ = 3996511 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3996594 and 3996603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3996439) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5047 + ... + 5784.

It is an arithmetic number, because the mean of its divisors is an integer number (492856).

Almost surely, 2^3996639 is an apocalyptic number.

3996639 is a deficient number, since it is larger than the sum of its proper divisors (1917633).

3996639 is a wasteful number, since it uses less digits than its factorization.

3996639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10878 (or 10875 counting only the distinct ones).

The product of its digits is 236196, while the sum is 45.

The square root of 3996639 is about 1999.1595734208. The cubic root of 3996639 is about 158.6956322806.

The spelling of 3996639 in words is "three million, nine hundred ninety-six thousand, six hundred thirty-nine".