840243 has 8 divisors (see below), whose sum is σ = 1124800. Its totient is φ = 557928.

The previous prime is 840241. The next prime is 840253. The reversal of 840243 is 342048.

It is a happy number.

840243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 840243 - 2¹ = 840241 is a prime.

It is a Duffinian number.

840243 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (840241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 768 + ... + 1506.

It is an arithmetic number, because the mean of its divisors is an integer number (140600).

2⁸⁴⁰²⁴³ is an apocalyptic number.

840243 is a deficient number, since it is larger than the sum of its proper divisors (284557).

840243 is a wasteful number, since it uses less digits than its factorization.

840243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 840243 is about 916.6476967734. The cubic root of 840243 is about 94.3629771389.

The spelling of 840243 in words is "eight hundred forty thousand, two hundred forty-three".