3931641646 has 16 divisors (see below), whose sum is σ = 6350212080. Its totient is φ = 1818824320.

The previous prime is 3931641613. The next prime is 3931641653. The reversal of 3931641646 is 6461461393.

3931641646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 977965 + ... + 981976.

It is an arithmetic number, because the mean of its divisors is an integer number (396888255).

Almost surely, 2^3931641646 is an apocalyptic number.

3931641646 is a deficient number, since it is larger than the sum of its proper divisors (2418570434).

3931641646 is a wasteful number, since it uses less digits than its factorization.

3931641646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1960019.

The product of its digits is 279936, while the sum is 43.

The square root of 3931641646 is about 62702.8041318728. The cubic root of 3931641646 is about 1578.3063684639.

The spelling of 3931641646 in words is "three billion, nine hundred thirty-one million, six hundred forty-one thousand, six hundred forty-six".