389809009 has 2 divisors, whose sum is σ = 389809010. Its totient is φ = 389809008.

The previous prime is 389808967. The next prime is 389809019. The reversal of 389809009 is 900908983.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 242113600 + 147695409 = 15560^2 + 12153^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-389809009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 389809009.

It is not a weakly prime, because it can be changed into another prime (389809019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194904504 + 194904505.

It is an arithmetic number, because the mean of its divisors is an integer number (194904505).

Almost surely, 2^389809009 is an apocalyptic number.

It is an amenable number.

389809009 is a deficient number, since it is larger than the sum of its proper divisors (1).

389809009 is an equidigital number, since it uses as much as digits as its factorization.

389809009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 389809009 is about 19743.5814633516. The cubic root of 389809009 is about 730.4950723194.

The spelling of 389809009 in words is "three hundred eighty-nine million, eight hundred nine thousand, nine".