540439 has 4 divisors (see below), whose sum is σ = 547360. Its totient is φ = 533520.

The previous prime is 540437. The next prime is 540461. The reversal of 540439 is 934045.

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 540439 - 2¹ = 540437 is a prime.

It is a Duffinian number.

540439 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (540433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3342 + ... + 3499.

It is an arithmetic number, because the mean of its divisors is an integer number (136840).

2⁵⁴⁰⁴³⁹ is an apocalyptic number.

540439 is a deficient number, since it is larger than the sum of its proper divisors (6921).

540439 is an equidigital number, since it uses as much as digits as its factorization.

540439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6920.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 540439 is about 735.1455638171. The cubic root of 540439 is about 81.4545897305.

It can be divided in two parts, 540 and 439, that added together give a palindrome (979).

The spelling of 540439 in words is "five hundred forty thousand, four hundred thirty-nine".