3931878872 has 16 divisors (see below), whose sum is σ = 7409698560. Its totient is φ = 1955959264.

The previous prime is 3931878871. The next prime is 3931878913. The reversal of 3931878872 is 2788781393.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3931878871) 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 3 ways as a sum of consecutive naturals, for example, 1245848 + ... + 1248999.

It is an arithmetic number, because the mean of its divisors is an integer number (463106160).

Almost surely, 2^3931878872 is an apocalyptic number.

It is an amenable number.

3931878872 is a deficient number, since it is larger than the sum of its proper divisors (3477819688).

3931878872 is a wasteful number, since it uses less digits than its factorization.

3931878872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2495050 (or 2495046 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 56.

The square root of 3931878872 is about 62704.6957731237. The cubic root of 3931878872 is about 1578.3381115889.

The spelling of 3931878872 in words is "three billion, nine hundred thirty-one million, eight hundred seventy-eight thousand, eight hundred seventy-two".