389516909 has 2 divisors, whose sum is σ = 389516910. Its totient is φ = 389516908.

The previous prime is 389516899. The next prime is 389516923. The reversal of 389516909 is 909615983.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 331422025 + 58094884 = 18205^2 + 7622^2 .

It is a cyclic number.

It is not a de Polignac number, because 389516909 - 2¹⁶ = 389451373 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (389516969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194758454 + 194758455.

It is an arithmetic number, because the mean of its divisors is an integer number (194758455).

Almost surely, 2^389516909 is an apocalyptic number.

It is an amenable number.

389516909 is a deficient number, since it is larger than the sum of its proper divisors (1).

389516909 is an equidigital number, since it uses as much as digits as its factorization.

389516909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 524880, while the sum is 50.

The square root of 389516909 is about 19736.1827362841. The cubic root of 389516909 is about 730.3125633424.

The spelling of 389516909 in words is "three hundred eighty-nine million, five hundred sixteen thousand, nine hundred nine".