6540223 has 4 divisors (see below), whose sum is σ = 6924960. Its totient is φ = 6155488.

The previous prime is 6540217. The next prime is 6540239. The reversal of 6540223 is 3220456.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6540223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6540194 and 6540203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6540293) 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, 192343 + ... + 192376.

It is an arithmetic number, because the mean of its divisors is an integer number (1731240).

Almost surely, 2^6540223 is an apocalyptic number.

6540223 is a deficient number, since it is larger than the sum of its proper divisors (384737).

6540223 is a wasteful number, since it uses less digits than its factorization.

6540223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384736.

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

The square root of 6540223 is about 2557.3859700874. The cubic root of 6540223 is about 187.0097223919.

Adding to 6540223 its reverse (3220456), we get a palindrome (9760679).

The spelling of 6540223 in words is "six million, five hundred forty thousand, two hundred twenty-three".