389439649 has 2 divisors, whose sum is σ = 389439650. Its totient is φ = 389439648.

The previous prime is 389439643. The next prime is 389439653. The reversal of 389439649 is 946934983.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 337383424 + 52056225 = 18368^2 + 7215^2 .

It is a cyclic number.

It is not a de Polignac number, because 389439649 - 2⁹ = 389439137 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 389439649.

It is not a weakly prime, because it can be changed into another prime (389439643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194719824 + 194719825.

It is an arithmetic number, because the mean of its divisors is an integer number (194719825).

Almost surely, 2^389439649 is an apocalyptic number.

It is an amenable number.

389439649 is a deficient number, since it is larger than the sum of its proper divisors (1).

389439649 is an equidigital number, since it uses as much as digits as its factorization.

389439649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5038848, while the sum is 55.

The square root of 389439649 is about 19734.2253204933. The cubic root of 389439649 is about 730.2642747416.

The spelling of 389439649 in words is "three hundred eighty-nine million, four hundred thirty-nine thousand, six hundred forty-nine".