491317440 has 112 divisors (see below), whose sum is σ = 1566915840. Its totient is φ = 130432000.

The previous prime is 491317427. The next prime is 491317451. The reversal of 491317440 is 44713194.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 239941 + ... + 241979.

It is an arithmetic number, because the mean of its divisors is an integer number (13990320).

Almost surely, 2^491317440 is an apocalyptic number.

491317440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491317440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (783457920).

491317440 is an abundant number, since it is smaller than the sum of its proper divisors (1075598400).

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

491317440 is a wasteful number, since it uses less digits than its factorization.

491317440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2310 (or 2300 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 491317440 is about 22165.6815821215. The cubic root of 491317440 is about 789.0794383176.

The spelling of 491317440 in words is "four hundred ninety-one million, three hundred seventeen thousand, four hundred forty".