3868316721 has 12 divisors (see below), whose sum is σ = 5594468880. Its totient is φ = 2575693080.

The previous prime is 3868316713. The next prime is 3868316743. The reversal of 3868316721 is 1276138683.

It is not a de Polignac number, because 3868316721 - 2³ = 3868316713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3868316701) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 257691 + ... + 272288.

It is an arithmetic number, because the mean of its divisors is an integer number (466205740).

Almost surely, 2^3868316721 is an apocalyptic number.

It is an amenable number.

3868316721 is a deficient number, since it is larger than the sum of its proper divisors (1726152159).

3868316721 is a wasteful number, since it uses less digits than its factorization.

3868316721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530796 (or 530793 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 3868316721 is about 62195.7934349261. The cubic root of 3868316721 is about 1569.7868077049.

The spelling of 3868316721 in words is "three billion, eight hundred sixty-eight million, three hundred sixteen thousand, seven hundred twenty-one".