384911993 has 2 divisors, whose sum is σ = 384911994. Its totient is φ = 384911992.

The previous prime is 384911971. The next prime is 384912001. The reversal of 384911993 is 399119483.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 239878144 + 145033849 = 15488^2 + 12043^2 .

It is a cyclic number.

It is not a de Polignac number, because 384911993 - 2¹⁸ = 384649849 is a prime.

It is not a weakly prime, because it can be changed into another prime (384911953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192455996 + 192455997.

It is an arithmetic number, because the mean of its divisors is an integer number (192455997).

Almost surely, 2^384911993 is an apocalyptic number.

It is an amenable number.

384911993 is a deficient number, since it is larger than the sum of its proper divisors (1).

384911993 is an equidigital number, since it uses as much as digits as its factorization.

384911993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 47.

The square root of 384911993 is about 19619.1741161548. The cubic root of 384911993 is about 727.4231993024.

The spelling of 384911993 in words is "three hundred eighty-four million, nine hundred eleven thousand, nine hundred ninety-three".