540623 has 4 divisors (see below), whose sum is σ = 548760. Its totient is φ = 532488.

The previous prime is 540619. The next prime is 540629. The reversal of 540623 is 326045.

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 540623 - 2² = 540619 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 540595 and 540604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (540629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3968 + ... + 4101.

It is an arithmetic number, because the mean of its divisors is an integer number (137190).

2⁵⁴⁰⁶²³ is an apocalyptic number.

540623 is a deficient number, since it is larger than the sum of its proper divisors (8137).

540623 is an equidigital number, since it uses as much as digits as its factorization.

540623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8136.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 540623 is about 735.2706984506. The cubic root of 540623 is about 81.4638327989.

Adding to 540623 its reverse (326045), we get a palindrome (866668).

The spelling of 540623 in words is "five hundred forty thousand, six hundred twenty-three".