2540403 has 20 divisors (see below), whose sum is σ = 3852640. Its totient is φ = 1667952.

The previous prime is 2540393. The next prime is 2540407. The reversal of 2540403 is 3040452.

It is a happy number.

It is not a de Polignac number, because 2540403 - 2⁶ = 2540339 is a prime.

It is a Duffinian number.

2540403 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2540407) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6201 + ... + 6597.

It is an arithmetic number, because the mean of its divisors is an integer number (192632).

2^2540403 is an apocalyptic number.

2540403 is a deficient number, since it is larger than the sum of its proper divisors (1312237).

2540403 is an equidigital number, since it uses as much as digits as its factorization.

2540403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488 (or 479 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 2540403 is about 1593.8641723811. The cubic root of 2540403 is about 136.4481145635.

Adding to 2540403 its reverse (3040452), we get a palindrome (5580855).

The spelling of 2540403 in words is "two million, five hundred forty thousand, four hundred three".