389287289 has 2 divisors, whose sum is σ = 389287290. Its totient is φ = 389287288.

The previous prime is 389287277. The next prime is 389287321. The reversal of 389287289 is 982782983.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 386790889 + 2496400 = 19667^2 + 1580^2 .

It is a cyclic number.

It is not a de Polignac number, because 389287289 - 2⁸ = 389287033 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (389187289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194643644 + 194643645.

It is an arithmetic number, because the mean of its divisors is an integer number (194643645).

Almost surely, 2^389287289 is an apocalyptic number.

It is an amenable number.

389287289 is a deficient number, since it is larger than the sum of its proper divisors (1).

389287289 is an equidigital number, since it uses as much as digits as its factorization.

389287289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3483648, while the sum is 56.

The square root of 389287289 is about 19730.3646443749. The cubic root of 389287289 is about 730.1690288517.

The spelling of 389287289 in words is "three hundred eighty-nine million, two hundred eighty-seven thousand, two hundred eighty-nine".