389998289 has 2 divisors, whose sum is σ = 389998290. Its totient is φ = 389998288.

The previous prime is 389998253. The next prime is 389998291. The reversal of 389998289 is 982899983.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 259467664 + 130530625 = 16108^2 + 11425^2 .

It is a cyclic number.

It is not a de Polignac number, because 389998289 - 2⁸ = 389998033 is a prime.

Together with 389998291, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (389998249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194999144 + 194999145.

It is an arithmetic number, because the mean of its divisors is an integer number (194999145).

Almost surely, 2^389998289 is an apocalyptic number.

It is an amenable number.

389998289 is a deficient number, since it is larger than the sum of its proper divisors (1).

389998289 is an equidigital number, since it uses as much as digits as its factorization.

389998289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20155392, while the sum is 65.

The square root of 389998289 is about 19748.3743381576. The cubic root of 389998289 is about 730.6132889593.

The spelling of 389998289 in words is "three hundred eighty-nine million, nine hundred ninety-eight thousand, two hundred eighty-nine".