540643 has 4 divisors (see below), whose sum is σ = 549568. Its totient is φ = 531720.

The previous prime is 540629. The next prime is 540677. The reversal of 540643 is 346045.

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 540643 - 2⁵ = 540611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (540613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4371 + ... + 4492.

It is an arithmetic number, because the mean of its divisors is an integer number (137392).

2⁵⁴⁰⁶⁴³ is an apocalyptic number.

540643 is a deficient number, since it is larger than the sum of its proper divisors (8925).

540643 is an equidigital number, since it uses as much as digits as its factorization.

540643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8924.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 540643 is about 735.2842987580. The cubic root of 540643 is about 81.4648373538.

Adding to 540643 its reverse (346045), we get a palindrome (886688).

The spelling of 540643 in words is "five hundred forty thousand, six hundred forty-three".