388942957817 has 2 divisors, whose sum is σ = 388942957818. Its totient is φ = 388942957816.

The previous prime is 388942957813. The next prime is 388942957841. The reversal of 388942957817 is 718759249883.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 385248627856 + 3694329961 = 620684^2 + 60781^2 .

It is a cyclic number.

It is not a de Polignac number, because 388942957817 - 2² = 388942957813 is a prime.

It is not a weakly prime, because it can be changed into another prime (388942957813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194471478908 + 194471478909.

It is an arithmetic number, because the mean of its divisors is an integer number (194471478909).

Almost surely, 2^388942957817 is an apocalyptic number.

It is an amenable number.

388942957817 is a deficient number, since it is larger than the sum of its proper divisors (1).

388942957817 is an equidigital number, since it uses as much as digits as its factorization.

388942957817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 243855360, while the sum is 71.

The spelling of 388942957817 in words is "three hundred eighty-eight billion, nine hundred forty-two million, nine hundred fifty-seven thousand, eight hundred seventeen".