3991389124 has 24 divisors (see below), whose sum is σ = 7120522080. Its totient is φ = 1957217856.

The previous prime is 3991389107. The next prime is 3991389197. The reversal of 3991389124 is 4219831993.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 28032 + ... + 93640.

It is an arithmetic number, because the mean of its divisors is an integer number (296688420).

Almost surely, 2^3991389124 is an apocalyptic number.

It is an amenable number.

3991389124 is a deficient number, since it is larger than the sum of its proper divisors (3129132956).

3991389124 is a wasteful number, since it uses less digits than its factorization.

3991389124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65907 (or 65905 counting only the distinct ones).

The product of its digits is 419904, while the sum is 49.

The square root of 3991389124 is about 63177.4415752965. The cubic root of 3991389124 is about 1586.2611574839.

The spelling of 3991389124 in words is "three billion, nine hundred ninety-one million, three hundred eighty-nine thousand, one hundred twenty-four".