491008 has 40 divisors (see below), whose sum is σ = 1129392. Its totient is φ = 208896.

The previous prime is 491003. The next prime is 491039. The reversal of 491008 is 800194.

It is a self number, because there is not a number n which added to its sum of digits gives 491008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491003) by changing a digit.

491008 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 3 ways as a sum of consecutive naturals, for example, 3516 + ... + 3652.

2⁴⁹¹⁰⁰⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (564696).

491008 is an abundant number, since it is smaller than the sum of its proper divisors (638384).

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

491008 is an equidigital number, since it uses as much as digits as its factorization.

491008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162 (or 146 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 491008 is about 700.7196300947. The cubic root of 491008 is about 78.8913745020.

The spelling of 491008 in words is "four hundred ninety-one thousand, eight".