491800 has 24 divisors (see below), whose sum is σ = 1143900. Its totient is φ = 196640.

The previous prime is 491797. The next prime is 491819. The reversal of 491800 is 8194.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1030 + ... + 1429.

2⁴⁹¹⁸⁰⁰ is an apocalyptic number.

491800 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

491800 is an abundant number, since it is smaller than the sum of its proper divisors (652100).

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

491800 is a wasteful number, since it uses less digits than its factorization.

491800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2475 (or 2466 counting only the distinct ones).

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

The square root of 491800 is about 701.2845356915. The cubic root of 491800 is about 78.9337691975.

Adding to 491800 its reverse (8194), we get a palindrome (499994).

It can be divided in two parts, 49 and 1800, that added together give a square (1849 = 43²).

The spelling of 491800 in words is "four hundred ninety-one thousand, eight hundred".