389383909 has 2 divisors, whose sum is σ = 389383910. Its totient is φ = 389383908.

The previous prime is 389383903. The next prime is 389383913. The reversal of 389383909 is 909383983.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 356378884 + 33005025 = 18878^2 + 5745^2 .

It is an emirp because it is prime and its reverse (909383983) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-389383909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (389383903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194691954 + 194691955.

It is an arithmetic number, because the mean of its divisors is an integer number (194691955).

Almost surely, 2^389383909 is an apocalyptic number.

It is an amenable number.

389383909 is a deficient number, since it is larger than the sum of its proper divisors (1).

389383909 is an equidigital number, since it uses as much as digits as its factorization.

389383909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1259712, while the sum is 52.

The square root of 389383909 is about 19732.8130027120. The cubic root of 389383909 is about 730.2294324814.

The spelling of 389383909 in words is "three hundred eighty-nine million, three hundred eighty-three thousand, nine hundred nine".