389933909 has 2 divisors, whose sum is σ = 389933910. Its totient is φ = 389933908.

The previous prime is 389933897. The next prime is 389933923. The reversal of 389933909 is 909339983.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 200788900 + 189145009 = 14170^2 + 13753^2 .

It is a cyclic number.

It is not a de Polignac number, because 389933909 - 2⁴ = 389933893 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (389932909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194966954 + 194966955.

It is an arithmetic number, because the mean of its divisors is an integer number (194966955).

Almost surely, 2^389933909 is an apocalyptic number.

It is an amenable number.

389933909 is a deficient number, since it is larger than the sum of its proper divisors (1).

389933909 is an equidigital number, since it uses as much as digits as its factorization.

389933909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1417176, while the sum is 53.

The square root of 389933909 is about 19746.7442632957. The cubic root of 389933909 is about 730.5730841059.

The spelling of 389933909 in words is "three hundred eighty-nine million, nine hundred thirty-three thousand, nine hundred nine".