491720 has 32 divisors (see below), whose sum is σ = 1166400. Its totient is φ = 186048.

The previous prime is 491719. The next prime is 491731. The reversal of 491720 is 27194.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 437 + ... + 1083.

It is an arithmetic number, because the mean of its divisors is an integer number (36450).

2⁴⁹¹⁷²⁰ is an apocalyptic number.

491720 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 491720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (583200).

491720 is an abundant number, since it is smaller than the sum of its proper divisors (674680).

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

491720 is a wasteful number, since it uses less digits than its factorization.

491720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677 (or 673 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 491720 is about 701.2274951826. The cubic root of 491720 is about 78.9294889725.

The spelling of 491720 in words is "four hundred ninety-one thousand, seven hundred twenty".