491766 has 16 divisors (see below), whose sum is σ = 1073088. Its totient is φ = 149000.

The previous prime is 491747. The next prime is 491773. The reversal of 491766 is 667194.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

491766 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3660 + ... + 3791.

It is an arithmetic number, because the mean of its divisors is an integer number (67068).

2⁴⁹¹⁷⁶⁶ is an apocalyptic number.

491766 is an abundant number, since it is smaller than the sum of its proper divisors (581322).

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

491766 is a wasteful number, since it uses less digits than its factorization.

491766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7467.

The product of its digits is 9072, while the sum is 33.

The square root of 491766 is about 701.2602940421. The cubic root of 491766 is about 78.9319501586.

The spelling of 491766 in words is "four hundred ninety-one thousand, seven hundred sixty-six".