3942131685 has 16 divisors (see below), whose sum is σ = 6639380160. Its totient is φ = 1991813760.

The previous prime is 3942131681. The next prime is 3942131719. The reversal of 3942131685 is 5861312493.

It is not a de Polignac number, because 3942131685 - 2² = 3942131681 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3942131681) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 6915736 + ... + 6916305.

It is an arithmetic number, because the mean of its divisors is an integer number (414961260).

Almost surely, 2^3942131685 is an apocalyptic number.

It is an amenable number.

3942131685 is a deficient number, since it is larger than the sum of its proper divisors (2697248475).

3942131685 is a wasteful number, since it uses less digits than its factorization.

3942131685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13832068.

The product of its digits is 155520, while the sum is 42.

The square root of 3942131685 is about 62786.3972927258. The cubic root of 3942131685 is about 1579.7088184500.

The spelling of 3942131685 in words is "three billion, nine hundred forty-two million, one hundred thirty-one thousand, six hundred eighty-five".