491685 has 8 divisors (see below), whose sum is σ = 786720. Its totient is φ = 262224.

The previous prime is 491677. The next prime is 491707. The reversal of 491685 is 586194.

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

It is not a de Polignac number, because 491685 - 2³ = 491677 is a prime.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 491685.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16375 + ... + 16404.

It is an arithmetic number, because the mean of its divisors is an integer number (98340).

2⁴⁹¹⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

491685 is a deficient number, since it is larger than the sum of its proper divisors (295035).

491685 is a wasteful number, since it uses less digits than its factorization.

491685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32787.

The product of its digits is 8640, while the sum is 33.

The square root of 491685 is about 701.2025385008. The cubic root of 491685 is about 78.9276162281.

It can be divided in two parts, 491 and 685, that added together give a triangular number (1176 = T₄₈).

The spelling of 491685 in words is "four hundred ninety-one thousand, six hundred eighty-five".