389235289 has 2 divisors, whose sum is σ = 389235290. Its totient is φ = 389235288.

The previous prime is 389235241. The next prime is 389235293. The reversal of 389235289 is 982532983.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 361304064 + 27931225 = 19008^2 + 5285^2 .

It is an emirp because it is prime and its reverse (982532983) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 389235289 - 2²³ = 380846681 is a prime.

It is a super-2 number, since 2×389235289² = 303008220405827042, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (389235239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194617644 + 194617645.

It is an arithmetic number, because the mean of its divisors is an integer number (194617645).

Almost surely, 2^389235289 is an apocalyptic number.

It is an amenable number.

389235289 is a deficient number, since it is larger than the sum of its proper divisors (1).

389235289 is an equidigital number, since it uses as much as digits as its factorization.

389235289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 933120, while the sum is 49.

The square root of 389235289 is about 19729.0468345534. The cubic root of 389235289 is about 730.1365160338.

The spelling of 389235289 in words is "three hundred eighty-nine million, two hundred thirty-five thousand, two hundred eighty-nine".