6540403 has 4 divisors (see below), whose sum is σ = 6558040. Its totient is φ = 6522768.

The previous prime is 6540383. The next prime is 6540407. The reversal of 6540403 is 3040456.

6540403 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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-6540403 is a prime.

It is a super-3 number, since 3×6540403³ (a number of 21 digits) contains 333 as substring.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (6540407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8250 + ... + 9007.

It is an arithmetic number, because the mean of its divisors is an integer number (1639510).

Almost surely, 2^6540403 is an apocalyptic number.

6540403 is a deficient number, since it is larger than the sum of its proper divisors (17637).

6540403 is a wasteful number, since it uses less digits than its factorization.

6540403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17636.

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

The square root of 6540403 is about 2557.4211620302. The cubic root of 6540403 is about 187.0114380032.

Adding to 6540403 its reverse (3040456), we get a palindrome (9580859).

The spelling of 6540403 in words is "six million, five hundred forty thousand, four hundred three".