840543 has 8 divisors (see below), whose sum is σ = 1222656. Its totient is φ = 509400.

The previous prime is 840523. The next prime is 840547. The reversal of 840543 is 345048.

It is a happy number.

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

It is not a de Polignac number, because 840543 - 2⁶ = 840479 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12703 + ... + 12768.

It is an arithmetic number, because the mean of its divisors is an integer number (152832).

2⁸⁴⁰⁵⁴³ is an apocalyptic number.

840543 is a deficient number, since it is larger than the sum of its proper divisors (382113).

840543 is a wasteful number, since it uses less digits than its factorization.

840543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25485.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 840543 is about 916.8113219196. The cubic root of 840543 is about 94.3742062416.

It can be divided in two parts, 8405 and 43, that added together give a palindrome (8448).

The spelling of 840543 in words is "eight hundred forty thousand, five hundred forty-three".