540685 has 8 divisors (see below), whose sum is σ = 687096. Its totient is φ = 407040.

The previous prime is 540679. The next prime is 540689. The reversal of 540685 is 586045.

It can be written as a sum of positive squares in 4 ways, for example, as 59049 + 481636 = 243^2 + 694^2 .

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

It is not a de Polignac number, because 540685 - 2³ = 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 (540689) 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 7 ways as a sum of consecutive naturals, for example, 3096 + ... + 3265.

It is an arithmetic number, because the mean of its divisors is an integer number (85887).

2⁵⁴⁰⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

540685 is a deficient number, since it is larger than the sum of its proper divisors (146411).

540685 is a wasteful number, since it uses less digits than its factorization.

540685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6383.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 540685 is about 735.3128585847. The cubic root of 540685 is about 81.4669468386.

It can be divided in two parts, 540 and 685, that added together give a triangular number (1225 = T₄₉).

The spelling of 540685 in words is "five hundred forty thousand, six hundred eighty-five".