389320309 has 4 divisors (see below), whose sum is σ = 444937504. Its totient is φ = 333703116.

The previous prime is 389320307. The next prime is 389320339. The reversal of 389320309 is 903023983.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 389320309 - 2¹ = 389320307 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389320301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27808587 + ... + 27808600.

It is an arithmetic number, because the mean of its divisors is an integer number (111234376).

Almost surely, 2^389320309 is an apocalyptic number.

It is an amenable number.

389320309 is a deficient number, since it is larger than the sum of its proper divisors (55617195).

389320309 is an equidigital number, since it uses as much as digits as its factorization.

389320309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55617194.

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 389320309 is about 19731.2014079224. The cubic root of 389320309 is about 730.1896729881.

The spelling of 389320309 in words is "three hundred eighty-nine million, three hundred twenty thousand, three hundred nine".