389845789 has 2 divisors, whose sum is σ = 389845790. Its totient is φ = 389845788.

The previous prime is 389845763. The next prime is 389845817. The reversal of 389845789 is 987548983.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 389746564 + 99225 = 19742^2 + 315^2 .

It is a cyclic number.

It is not a de Polignac number, because 389845789 - 2⁹ = 389845277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (389845889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194922894 + 194922895.

It is an arithmetic number, because the mean of its divisors is an integer number (194922895).

Almost surely, 2^389845789 is an apocalyptic number.

It is an amenable number.

389845789 is a deficient number, since it is larger than the sum of its proper divisors (1).

389845789 is an equidigital number, since it uses as much as digits as its factorization.

389845789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17418240, while the sum is 61.

The square root of 389845789 is about 19744.5128833304. The cubic root of 389845789 is about 730.5180466164.

The spelling of 389845789 in words is "three hundred eighty-nine million, eight hundred forty-five thousand, seven hundred eighty-nine".