3936021686 has 4 divisors (see below), whose sum is σ = 5904032532. Its totient is φ = 1968010842.

The previous prime is 3936021647. The next prime is 3936021737. The reversal of 3936021686 is 6861206393.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 984005420 + ... + 984005423.

It is an arithmetic number, because the mean of its divisors is an integer number (1476008133).

Almost surely, 2^3936021686 is an apocalyptic number.

3936021686 is a deficient number, since it is larger than the sum of its proper divisors (1968010846).

3936021686 is a wasteful number, since it uses less digits than its factorization.

3936021686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1968010845.

The product of its (nonzero) digits is 279936, while the sum is 44.

The square root of 3936021686 is about 62737.7213963019. The cubic root of 3936021686 is about 1578.8922542999.

The spelling of 3936021686 in words is "three billion, nine hundred thirty-six million, twenty-one thousand, six hundred eighty-six".