389442728 has 16 divisors (see below), whose sum is σ = 743983380. Its totient is φ = 191047168.

The previous prime is 389442709. The next prime is 389442731. The reversal of 389442728 is 827244983.

It can be written as a sum of positive squares in 2 ways, for example, as 388799524 + 643204 = 19718^2 + 802^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 458825 + ... + 459672.

Almost surely, 2^389442728 is an apocalyptic number.

It is an amenable number.

389442728 is a deficient number, since it is larger than the sum of its proper divisors (354540652).

389442728 is a wasteful number, since it uses less digits than its factorization.

389442728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918556 (or 918552 counting only the distinct ones).

The product of its digits is 774144, while the sum is 47.

The square root of 389442728 is about 19734.3033320155. The cubic root of 389442728 is about 730.2661992827.

The spelling of 389442728 in words is "three hundred eighty-nine million, four hundred forty-two thousand, seven hundred twenty-eight".