491586 has 8 divisors (see below), whose sum is σ = 983184. Its totient is φ = 163860.

The previous prime is 491581. The next prime is 491591. The reversal of 491586 is 685194.

It is an interprime number because it is at equal distance from previous prime (491581) and next prime (491591).

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

491586 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (491581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40960 + ... + 40971.

It is an arithmetic number, because the mean of its divisors is an integer number (122898).

2⁴⁹¹⁵⁸⁶ is an apocalyptic number.

491586 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

491586 is a wasteful number, since it uses less digits than its factorization.

491586 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81936.

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

The square root of 491586 is about 701.1319419339. The cubic root of 491586 is about 78.9223185555.

The spelling of 491586 in words is "four hundred ninety-one thousand, five hundred eighty-six".