540840 has 32 divisors (see below), whose sum is σ = 1622880. Its totient is φ = 144192.

The previous prime is 540823. The next prime is 540851. The reversal of 540840 is 48045.

It is an unprimeable number.

540840 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 (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2134 + ... + 2373.

It is an arithmetic number, because the mean of its divisors is an integer number (50715).

2⁵⁴⁰⁸⁴⁰ is an apocalyptic number.

It is an amenable number.

540840 is an abundant number, since it is smaller than the sum of its proper divisors (1082040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

540840 is a wasteful number, since it uses less digits than its factorization.

540840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4521 (or 4517 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 540840 is about 735.4182483458. The cubic root of 540840 is about 81.4747308967.

Adding to 540840 its reverse (48045), we get a palindrome (588885).

The spelling of 540840 in words is "five hundred forty thousand, eight hundred forty".