387971345721 has 32 divisors (see below), whose sum is σ = 528713319168. Its totient is φ = 252998036480.

The previous prime is 387971345711. The next prime is 387971345803. The reversal of 387971345721 is 127543179783.

It is a cyclic number.

It is not a de Polignac number, because 387971345721 - 2¹¹ = 387971343673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (387971345711) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 78581965 + ... + 78586901.

It is an arithmetic number, because the mean of its divisors is an integer number (16522291224).

Almost surely, 2^387971345721 is an apocalyptic number.

It is an amenable number.

387971345721 is a deficient number, since it is larger than the sum of its proper divisors (140741973447).

387971345721 is a wasteful number, since it uses less digits than its factorization.

387971345721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7841.

The product of its digits is 8890560, while the sum is 57.

The spelling of 387971345721 in words is "three hundred eighty-seven billion, nine hundred seventy-one million, three hundred forty-five thousand, seven hundred twenty-one".