540403 has 4 divisors (see below), whose sum is σ = 542808. Its totient is φ = 538000.

The previous prime is 540391. The next prime is 540433. The reversal of 540403 is 304045.

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-540403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (540433) 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, 826 + ... + 1327.

It is an arithmetic number, because the mean of its divisors is an integer number (135702).

2⁵⁴⁰⁴⁰³ is an apocalyptic number.

540403 is a deficient number, since it is larger than the sum of its proper divisors (2405).

540403 is a wasteful number, since it uses less digits than its factorization.

540403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2404.

The product of its (nonzero) digits is 240, while the sum is 16.

The square root of 540403 is about 735.1210784626. The cubic root of 540403 is about 81.4527810587.

Adding to 540403 its reverse (304045), we get a palindrome (844448).

The spelling of 540403 in words is "five hundred forty thousand, four hundred three".