540221 has 8 divisors (see below), whose sum is σ = 598944. Its totient is φ = 483120.

The previous prime is 540217. The next prime is 540233. The reversal of 540221 is 122045.

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

It is not a de Polignac number, because 540221 - 2² = 540217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 540196 and 540205.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 540221.

It is not an unprimeable number, because it can be changed into a prime (540251) by changing a digit.

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, 371 + ... + 1103.

It is an arithmetic number, because the mean of its divisors is an integer number (74868).

2⁵⁴⁰²²¹ is an apocalyptic number.

It is an amenable number.

540221 is a deficient number, since it is larger than the sum of its proper divisors (58723).

540221 is a wasteful number, since it uses less digits than its factorization.

540221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 540221 is about 734.9972789065. The cubic root of 540221 is about 81.4436359881.

Adding to 540221 its reverse (122045), we get a palindrome (662266).

The spelling of 540221 in words is "five hundred forty thousand, two hundred twenty-one".