389933689 has 2 divisors, whose sum is σ = 389933690. Its totient is φ = 389933688.

The previous prime is 389933671. The next prime is 389933699. The reversal of 389933689 is 986339983.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 377913600 + 12020089 = 19440^2 + 3467^2 .

It is a cyclic number.

It is not a de Polignac number, because 389933689 - 2¹⁷ = 389802617 is a prime.

It is not a weakly prime, because it can be changed into another prime (389933669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194966844 + 194966845.

It is an arithmetic number, because the mean of its divisors is an integer number (194966845).

Almost surely, 2^389933689 is an apocalyptic number.

It is an amenable number.

389933689 is a deficient number, since it is larger than the sum of its proper divisors (1).

389933689 is an equidigital number, since it uses as much as digits as its factorization.

389933689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7558272, while the sum is 58.

The square root of 389933689 is about 19746.7386927563. The cubic root of 389933689 is about 730.5729467099.

The spelling of 389933689 in words is "three hundred eighty-nine million, nine hundred thirty-three thousand, six hundred eighty-nine".