389475791 has 2 divisors, whose sum is σ = 389475792. Its totient is φ = 389475790.

The previous prime is 389475787. The next prime is 389475799. The reversal of 389475791 is 197574983.

It is a weak prime.

It is an emirp because it is prime and its reverse (197574983) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 389475791 - 2² = 389475787 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (389475799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194737895 + 194737896.

It is an arithmetic number, because the mean of its divisors is an integer number (194737896).

Almost surely, 2^389475791 is an apocalyptic number.

389475791 is a deficient number, since it is larger than the sum of its proper divisors (1).

389475791 is an equidigital number, since it uses as much as digits as its factorization.

389475791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1905120, while the sum is 53.

The square root of 389475791 is about 19735.1410179912. The cubic root of 389475791 is about 730.2868648015.

The spelling of 389475791 in words is "three hundred eighty-nine million, four hundred seventy-five thousand, seven hundred ninety-one".