389856566 has 16 divisors (see below), whose sum is σ = 644267088. Its totient is φ = 175452000.

The previous prime is 389856557. The next prime is 389856569. The reversal of 389856566 is 665658983.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389856569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85505 + ... + 89948.

It is an arithmetic number, because the mean of its divisors is an integer number (40266693).

Almost surely, 2^389856566 is an apocalyptic number.

389856566 is a deficient number, since it is larger than the sum of its proper divisors (254410522).

389856566 is a wasteful number, since it uses less digits than its factorization.

389856566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175567.

The product of its digits is 9331200, while the sum is 56.

The square root of 389856566 is about 19744.7857927099. The cubic root of 389856566 is about 730.5247780990.

The spelling of 389856566 in words is "three hundred eighty-nine million, eight hundred fifty-six thousand, five hundred sixty-six".