491810 has 32 divisors (see below), whose sum is σ = 1026432. Its totient is φ = 167680.

The previous prime is 491797. The next prime is 491819. The reversal of 491810 is 18194.

491810 = 30² + 31² + ... + 114².

It is a super-2 number, since 2×491810² = 483754152200, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 491810.

It is not an unprimeable number, because it can be changed into a prime (491819) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1739 + ... + 2001.

It is an arithmetic number, because the mean of its divisors is an integer number (32076).

2⁴⁹¹⁸¹⁰ is an apocalyptic number.

491810 is an abundant number, since it is smaller than the sum of its proper divisors (534622).

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

491810 is a wasteful number, since it uses less digits than its factorization.

491810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 491810 is about 701.2916654289. The cubic root of 491810 is about 78.9343041930.

The spelling of 491810 in words is "four hundred ninety-one thousand, eight hundred ten".