540709 has 4 divisors (see below), whose sum is σ = 582316. Its totient is φ = 499104.

The previous prime is 540703. The next prime is 540713. The reversal of 540709 is 907045.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 907045 = 5 ⋅181409.

It can be written as a sum of positive squares in 2 ways, for example, as 91809 + 448900 = 303^2 + 670^2 .

It is a cyclic number.

It is not a de Polignac number, because 540709 - 2⁵ = 540677 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 (540703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20784 + ... + 20809.

It is an arithmetic number, because the mean of its divisors is an integer number (145579).

2⁵⁴⁰⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

540709 is a deficient number, since it is larger than the sum of its proper divisors (41607).

540709 is a wasteful number, since it uses less digits than its factorization.

540709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41606.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 540709 is about 735.3291779877. The cubic root of 540709 is about 81.4681522095.

The spelling of 540709 in words is "five hundred forty thousand, seven hundred nine".