491988224 has 144 divisors (see below), whose sum is σ = 1236211200. Its totient is φ = 194181120.

The previous prime is 491988209. The next prime is 491988229. The reversal of 491988224 is 422889194.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491988229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1141289 + ... + 1141719.

It is an arithmetic number, because the mean of its divisors is an integer number (8584800).

Almost surely, 2^491988224 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 491988224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (618105600).

491988224 is an abundant number, since it is smaller than the sum of its proper divisors (744222976).

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

491988224 is an equidigital number, since it uses as much as digits as its factorization.

491988224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481 (or 453 counting only the distinct ones).

The product of its digits is 331776, while the sum is 47.

The square root of 491988224 is about 22180.8075596900. The cubic root of 491988224 is about 789.4383788045.

The spelling of 491988224 in words is "four hundred ninety-one million, nine hundred eighty-eight thousand, two hundred twenty-four".