3931213844 has 12 divisors (see below), whose sum is σ = 6884014368. Its totient is φ = 1964352600.

The previous prime is 3931213823. The next prime is 3931213883. The reversal of 3931213844 is 4483121393.

It is a junction number, because it is equal to n+sod(n) for n = 3931213798 and 3931213807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 306512 + ... + 319079.

It is an arithmetic number, because the mean of its divisors is an integer number (573667864).

Almost surely, 2^3931213844 is an apocalyptic number.

It is an amenable number.

3931213844 is a deficient number, since it is larger than the sum of its proper divisors (2952800524).

3931213844 is a wasteful number, since it uses less digits than its factorization.

3931213844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627166 (or 627164 counting only the distinct ones).

The product of its digits is 62208, while the sum is 38.

The square root of 3931213844 is about 62699.3926924336. The cubic root of 3931213844 is about 1578.2491212058.

The spelling of 3931213844 in words is "three billion, nine hundred thirty-one million, two hundred thirteen thousand, eight hundred forty-four".