810243 has 20 divisors (see below), whose sum is σ = 1384240. Its totient is φ = 462672.

The previous prime is 810239. The next prime is 810253. The reversal of 810243 is 342018.

It is a happy number.

It is not a de Polignac number, because 810243 - 2² = 810239 is a prime.

It is a Duffinian number.

810243 is a modest number, since divided by 243 gives 81 as remainder.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 810243.

It is not an unprimeable number, because it can be changed into a prime (810223) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 148 + ... + 1281.

It is an arithmetic number, because the mean of its divisors is an integer number (69212).

2⁸¹⁰²⁴³ is an apocalyptic number.

810243 is a deficient number, since it is larger than the sum of its proper divisors (573997).

810243 is a wasteful number, since it uses less digits than its factorization.

810243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1448 (or 1439 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 810243 is about 900.1349898765. The cubic root of 810243 is about 93.2262959441.

The spelling of 810243 in words is "eight hundred ten thousand, two hundred forty-three".