491339520 has 360 divisors, whose sum is σ = 2012228064. Its totient is φ = 112140288.

The previous prime is 491339509. The next prime is 491339533. The reversal of 491339520 is 25933194.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (360).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 725422 + ... + 726098.

Almost surely, 2^491339520 is an apocalyptic number.

491339520 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 491339520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1006114032).

491339520 is an abundant number, since it is smaller than the sum of its proper divisors (1520888544).

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

491339520 is an equidigital number, since it uses as much as digits as its factorization.

491339520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717 (or 694 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 491339520 is about 22166.1796437726. The cubic root of 491339520 is about 789.0912586545.

It can be divided in two parts, 49133 and 9520, that added together give a triangular number (58653 = T₃₄₂).

The spelling of 491339520 in words is "four hundred ninety-one million, three hundred thirty-nine thousand, five hundred twenty".