16389209 has 2 divisors, whose sum is σ = 16389210. Its totient is φ = 16389208.

The previous prime is 16389203. The next prime is 16389227. The reversal of 16389209 is 90298361.

16389209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15015625 + 1373584 = 3875^2 + 1172^2 .

It is a cyclic number.

It is not a de Polignac number, because 16389209 - 2⁴ = 16389193 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (16389203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8194604 + 8194605.

It is an arithmetic number, because the mean of its divisors is an integer number (8194605).

Almost surely, 2^16389209 is an apocalyptic number.

It is an amenable number.

16389209 is a deficient number, since it is larger than the sum of its proper divisors (1).

16389209 is an equidigital number, since it uses as much as digits as its factorization.

16389209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 16389209 is about 4048.3588032683. The cubic root of 16389209 is about 254.0110820386.

The spelling of 16389209 in words is "sixteen million, three hundred eighty-nine thousand, two hundred nine".