540843 has 4 divisors (see below), whose sum is σ = 721128. Its totient is φ = 360560.

The previous prime is 540823. The next prime is 540851. The reversal of 540843 is 348045.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 540843 - 2⁶ = 540779 is a prime.

It is a super-2 number, since 2×540843² = 585022301298, which contains 22 as substring.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (540803) 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 3 ways as a sum of consecutive naturals, for example, 90138 + ... + 90143.

It is an arithmetic number, because the mean of its divisors is an integer number (180282).

2⁵⁴⁰⁸⁴³ is an apocalyptic number.

540843 is a deficient number, since it is larger than the sum of its proper divisors (180285).

540843 is a wasteful number, since it uses less digits than its factorization.

540843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180284.

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

The square root of 540843 is about 735.4202879986. The cubic root of 540843 is about 81.4748815412.

Adding to 540843 its reverse (348045), we get a palindrome (888888).

The spelling of 540843 in words is "five hundred forty thousand, eight hundred forty-three".