489321918 has 128 divisors (see below), whose sum is σ = 1194393600. Its totient is φ = 148024800.

The previous prime is 489321907. The next prime is 489321919. The reversal of 489321918 is 819123984.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (489321919) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2733553 + ... + 2733731.

It is an arithmetic number, because the mean of its divisors is an integer number (9331200).

Almost surely, 2^489321918 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 489321918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (597196800).

489321918 is an abundant number, since it is smaller than the sum of its proper divisors (705071682).

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

489321918 is a wasteful number, since it uses less digits than its factorization.

489321918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315 (or 309 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 489321918 is about 22120.6220075295. The cubic root of 489321918 is about 788.0096872816.

The spelling of 489321918 in words is "four hundred eighty-nine million, three hundred twenty-one thousand, nine hundred eighteen".