3931636 has 6 divisors (see below), whose sum is σ = 6880370. Its totient is φ = 1965816.

The previous prime is 3931589. The next prime is 3931639. The reversal of 3931636 is 6361393.

It can be written as a sum of positive squares in only one way, i.e., 3920400 + 11236 = 1980^2 + 106^2 .

It is a junction number, because it is equal to n+sod(n) for n = 3931598 and 3931607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3931639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 491451 + ... + 491458.

Almost surely, 2^3931636 is an apocalyptic number.

It is an amenable number.

3931636 is a deficient number, since it is larger than the sum of its proper divisors (2948734).

3931636 is a wasteful number, since it uses less digits than its factorization.

3931636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 982913 (or 982911 counting only the distinct ones).

The product of its digits is 8748, while the sum is 31.

The square root of 3931636 is about 1982.8353436430. The cubic root of 3931636 is about 157.8305612959.

The spelling of 3931636 in words is "three million, nine hundred thirty-one thousand, six hundred thirty-six".