388775993 has 2 divisors, whose sum is σ = 388775994. Its totient is φ = 388775992.

The previous prime is 388775971. The next prime is 388776071. The reversal of 388775993 is 399577883.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 296769529 + 92006464 = 17227^2 + 9592^2 .

It is a cyclic number.

It is not a de Polignac number, because 388775993 - 2¹² = 388771897 is a prime.

It is a super-2 number, since 2×388775993² = 302293545466272098, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (388775953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194387996 + 194387997.

It is an arithmetic number, because the mean of its divisors is an integer number (194387997).

Almost surely, 2^388775993 is an apocalyptic number.

It is an amenable number.

388775993 is a deficient number, since it is larger than the sum of its proper divisors (1).

388775993 is an equidigital number, since it uses as much as digits as its factorization.

388775993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11430720, while the sum is 59.

The square root of 388775993 is about 19717.4033026664. The cubic root of 388775993 is about 729.8492169967.

The spelling of 388775993 in words is "three hundred eighty-eight million, seven hundred seventy-five thousand, nine hundred ninety-three".