389905992 has 144 divisors (see below), whose sum is σ = 1274307840. Its totient is φ = 105489216.

The previous prime is 389905979. The next prime is 389905993. The reversal of 389905992 is 299509983.

It is not an unprimeable number, because it can be changed into a prime (389905993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 180873 + ... + 183015.

It is an arithmetic number, because the mean of its divisors is an integer number (8849360).

Almost surely, 2^389905992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 389905992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (637153920).

389905992 is an abundant number, since it is smaller than the sum of its proper divisors (884401848).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

389905992 is a wasteful number, since it uses less digits than its factorization.

389905992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2200 (or 2174 counting only the distinct ones).

The product of its (nonzero) digits is 1574640, while the sum is 54.

The square root of 389905992 is about 19746.0373746228. The cubic root of 389905992 is about 730.5556487619. Note that the first 3 decimals are identical.

The spelling of 389905992 in words is "three hundred eighty-nine million, nine hundred five thousand, nine hundred ninety-two".