389728785 has 16 divisors (see below), whose sum is σ = 623845440. Its totient is φ = 207762240.

The previous prime is 389728783. The next prime is 389728789. The reversal of 389728785 is 587827983.

It is a happy number.

It is not a de Polignac number, because 389728785 - 2¹ = 389728783 is a prime.

It is not an unprimeable number, because it can be changed into a prime (389728783) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40851 + ... + 49479.

It is an arithmetic number, because the mean of its divisors is an integer number (38990340).

Almost surely, 2^389728785 is an apocalyptic number.

It is an amenable number.

389728785 is a deficient number, since it is larger than the sum of its proper divisors (234116655).

389728785 is a wasteful number, since it uses less digits than its factorization.

389728785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11648.

The product of its digits is 6773760, while the sum is 57.

The square root of 389728785 is about 19741.5497112056. The cubic root of 389728785 is about 730.4449561035. Note that the first 3 decimals are identical.

The spelling of 389728785 in words is "three hundred eighty-nine million, seven hundred twenty-eight thousand, seven hundred eighty-five".