6540423 has 4 divisors (see below), whose sum is σ = 8720568. Its totient is φ = 4360280.

The previous prime is 6540421. The next prime is 6540431. The reversal of 6540423 is 3240456.

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 6540423 - 2¹ = 6540421 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 6540393 and 6540402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6540421) 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, 1090068 + ... + 1090073.

It is an arithmetic number, because the mean of its divisors is an integer number (2180142).

Almost surely, 2^6540423 is an apocalyptic number.

6540423 is a deficient number, since it is larger than the sum of its proper divisors (2180145).

6540423 is a wasteful number, since it uses less digits than its factorization.

6540423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2180144.

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 6540423 is about 2557.4250722162. The cubic root of 6540423 is about 187.0116286248.

Adding to 6540423 its reverse (3240456), we get a palindrome (9780879).

The spelling of 6540423 in words is "six million, five hundred forty thousand, four hundred twenty-three".