3931678939 has 4 divisors (see below), whose sum is σ = 3931949224. Its totient is φ = 3931408656.

The previous prime is 3931678931. The next prime is 3931678951. The reversal of 3931678939 is 9398761393.

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

It is a cyclic number.

It is not a de Polignac number, because 3931678939 - 2³ = 3931678931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3931678931) 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 in 3 ways as a sum of consecutive naturals, for example, 112002 + ... + 142855.

It is an arithmetic number, because the mean of its divisors is an integer number (982987306).

Almost surely, 2^3931678939 is an apocalyptic number.

3931678939 is a deficient number, since it is larger than the sum of its proper divisors (270285).

3931678939 is a wasteful number, since it uses less digits than its factorization.

3931678939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270284.

The product of its digits is 6613488, while the sum is 58.

The square root of 3931678939 is about 62703.1015102124. The cubic root of 3931678939 is about 1578.3113587113.

The spelling of 3931678939 in words is "three billion, nine hundred thirty-one million, six hundred seventy-eight thousand, nine hundred thirty-nine".