540566 has 16 divisors (see below), whose sum is σ = 925344. Its totient is φ = 234624.

The previous prime is 540559. The next prime is 540577. The reversal of 540566 is 665045.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

540566 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 7 ways as a sum of consecutive naturals, for example, 170 + ... + 1053.

It is an arithmetic number, because the mean of its divisors is an integer number (57834).

2⁵⁴⁰⁵⁶⁶ is an apocalyptic number.

540566 is a deficient number, since it is larger than the sum of its proper divisors (384778).

540566 is a wasteful number, since it uses less digits than its factorization.

540566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1255.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 540566 is about 735.2319361943. The cubic root of 540566 is about 81.4609696813.

The spelling of 540566 in words is "five hundred forty thousand, five hundred sixty-six".