491808 has 48 divisors (see below), whose sum is σ = 1330560. Its totient is φ = 158976.

The previous prime is 491797. The next prime is 491819. The reversal of 491808 is 808194.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (491797) and next prime (491819).

It is a tau number, because it is divible by the number of its divisors (48).

It is a nialpdrome in base 14.

It is an unprimeable number.

491808 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, 4458 + ... + 4566.

It is an arithmetic number, because the mean of its divisors is an integer number (27720).

2⁴⁹¹⁸⁰⁸ is an apocalyptic number.

491808 is a gapful number since it is divisible by the number (48) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (665280).

491808 is an abundant number, since it is smaller than the sum of its proper divisors (838752).

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

491808 is a wasteful number, since it uses less digits than its factorization.

491808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169 (or 161 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 491808 is about 701.2902394872. The cubic root of 491808 is about 78.9341971945.

The spelling of 491808 in words is "four hundred ninety-one thousand, eight hundred eight".