3936021685 has 4 divisors (see below), whose sum is σ = 4723226028. Its totient is φ = 3148817344.

The previous prime is 3936021647. The next prime is 3936021737. The reversal of 3936021685 is 5861206393.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2427631441 + 1508390244 = 49271^2 + 38838^2 .

It is a cyclic number.

It is not a de Polignac number, because 3936021685 - 2¹³ = 3936013493 is a prime.

It is a Duffinian number.

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 in 3 ways as a sum of consecutive naturals, for example, 393602164 + ... + 393602173.

It is an arithmetic number, because the mean of its divisors is an integer number (1180806507).

Almost surely, 2^3936021685 is an apocalyptic number.

It is an amenable number.

3936021685 is a deficient number, since it is larger than the sum of its proper divisors (787204343).

3936021685 is an equidigital number, since it uses as much as digits as its factorization.

3936021685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787204342.

The product of its (nonzero) digits is 233280, while the sum is 43.

The square root of 3936021685 is about 62737.7213883322. The cubic root of 3936021685 is about 1578.8922541662.

The spelling of 3936021685 in words is "three billion, nine hundred thirty-six million, twenty-one thousand, six hundred eighty-five".