3931643138 has 32 divisors (see below), whose sum is σ = 6472369152. Its totient is φ = 1785326400.

The previous prime is 3931643119. The next prime is 3931643249. The reversal of 3931643138 is 8313461393.

It is a junction number, because it is equal to n+sod(n) for n = 3931643095 and 3931643104.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49568 + ... + 101588.

It is an arithmetic number, because the mean of its divisors is an integer number (202261536).

Almost surely, 2^3931643138 is an apocalyptic number.

3931643138 is a deficient number, since it is larger than the sum of its proper divisors (2540726014).

3931643138 is a wasteful number, since it uses less digits than its factorization.

3931643138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52130.

The product of its digits is 139968, while the sum is 41.

The square root of 3931643138 is about 62702.8160292662. The cubic root of 3931643138 is about 1578.3065681119.

The spelling of 3931643138 in words is "three billion, nine hundred thirty-one million, six hundred forty-three thousand, one hundred thirty-eight".