389691329 has 2 divisors, whose sum is σ = 389691330. Its totient is φ = 389691328.

The previous prime is 389691293. The next prime is 389691331. The reversal of 389691329 is 923196983.

Together with previous prime (389691293) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 267257104 + 122434225 = 16348^2 + 11065^2 .

It is a cyclic number.

It is not a de Polignac number, because 389691329 - 2⁸ = 389691073 is a prime.

Together with 389691331, 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 (389621329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194845664 + 194845665.

It is an arithmetic number, because the mean of its divisors is an integer number (194845665).

Almost surely, 2^389691329 is an apocalyptic number.

It is an amenable number.

389691329 is a deficient number, since it is larger than the sum of its proper divisors (1).

389691329 is an equidigital number, since it uses as much as digits as its factorization.

389691329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 629856, while the sum is 50.

The square root of 389691329 is about 19740.6010293507. The cubic root of 389691329 is about 730.4215548530.

The spelling of 389691329 in words is "three hundred eighty-nine million, six hundred ninety-one thousand, three hundred twenty-nine".