491785 has 8 divisors (see below), whose sum is σ = 674496. Its totient is φ = 337200.

The previous prime is 491783. The next prime is 491789. The reversal of 491785 is 587194.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 491785 - 2¹ = 491783 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 491785.

It is not an unprimeable number, because it can be changed into a prime (491783) by changing a digit.

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, 6991 + ... + 7060.

It is an arithmetic number, because the mean of its divisors is an integer number (84312).

2⁴⁹¹⁷⁸⁵ is an apocalyptic number.

It is an amenable number.

491785 is a deficient number, since it is larger than the sum of its proper divisors (182711).

491785 is a wasteful number, since it uses less digits than its factorization.

491785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14063.

The product of its digits is 10080, while the sum is 34.

The square root of 491785 is about 701.2738409495. The cubic root of 491785 is about 78.9329666907.

The spelling of 491785 in words is "four hundred ninety-one thousand, seven hundred eighty-five".