389689343993 has 2 divisors, whose sum is σ = 389689343994. Its totient is φ = 389689343992.

The previous prime is 389689343983. The next prime is 389689344017. The reversal of 389689343993 is 399343986983.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 382798351849 + 6890992144 = 618707^2 + 83012^2 .

It is a cyclic number.

It is not a de Polignac number, because 389689343993 - 2⁶ = 389689343929 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 389689343993.

It is not a weakly prime, because it can be changed into another prime (389689343903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194844671996 + 194844671997.

It is an arithmetic number, because the mean of its divisors is an integer number (194844671997).

Almost surely, 2^389689343993 is an apocalyptic number.

It is an amenable number.

389689343993 is a deficient number, since it is larger than the sum of its proper divisors (1).

389689343993 is an equidigital number, since it uses as much as digits as its factorization.

389689343993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816293376, while the sum is 74.

The spelling of 389689343993 in words is "three hundred eighty-nine billion, six hundred eighty-nine million, three hundred forty-three thousand, nine hundred ninety-three".