3891979444 has 24 divisors (see below), whose sum is σ = 7034017536. Its totient is φ = 1882320000.

The previous prime is 3891979411. The next prime is 3891979447. The reversal of 3891979444 is 4449791983.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3891979447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 307644 + ... + 320044.

It is an arithmetic number, because the mean of its divisors is an integer number (293084064).

Almost surely, 2^3891979444 is an apocalyptic number.

It is an amenable number.

3891979444 is a deficient number, since it is larger than the sum of its proper divisors (3142038092).

3891979444 is a wasteful number, since it uses less digits than its factorization.

3891979444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14967 (or 14965 counting only the distinct ones).

The product of its digits is 7838208, while the sum is 58.

The square root of 3891979444 is about 62385.7310929350. The cubic root of 3891979444 is about 1572.9811296072.

The spelling of 3891979444 in words is "three billion, eight hundred ninety-one million, nine hundred seventy-nine thousand, four hundred forty-four".