540839 has 4 divisors (see below), whose sum is σ = 582456. Its totient is φ = 499224.

The previous prime is 540823. The next prime is 540851. The reversal of 540839 is 938045.

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 540839 - 2⁴ = 540823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (540809) 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, 20789 + ... + 20814.

It is an arithmetic number, because the mean of its divisors is an integer number (145614).

2⁵⁴⁰⁸³⁹ is an apocalyptic number.

540839 is a deficient number, since it is larger than the sum of its proper divisors (41617).

540839 is a wasteful number, since it uses less digits than its factorization.

540839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41616.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 540839 is about 735.4175684603. The cubic root of 540839 is about 81.4746806818.

The spelling of 540839 in words is "five hundred forty thousand, eight hundred thirty-nine".