2543403 has 8 divisors (see below), whose sum is σ = 3400000. Its totient is φ = 1691208.

The previous prime is 2543399. The next prime is 2543413. The reversal of 2543403 is 3043452.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2543403 - 2² = 2543399 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2543403.

It is not an unprimeable number, because it can be changed into a prime (2543413) 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 7 ways as a sum of consecutive naturals, for example, 648 + ... + 2346.

It is an arithmetic number, because the mean of its divisors is an integer number (425000).

2^2543403 is an apocalyptic number.

2543403 is a deficient number, since it is larger than the sum of its proper divisors (856597).

2543403 is a wasteful number, since it uses less digits than its factorization.

2543403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2201.

The product of its (nonzero) digits is 1440, while the sum is 21.

The square root of 2543403 is about 1594.8050037544. The cubic root of 2543403 is about 136.5018046428.

Adding to 2543403 its reverse (3043452), we get a palindrome (5586855).

The spelling of 2543403 in words is "two million, five hundred forty-three thousand, four hundred three".