2540243 has 4 divisors (see below), whose sum is σ = 2673960. Its totient is φ = 2406528.

The previous prime is 2540231. The next prime is 2540249. The reversal of 2540243 is 3420452.

2540243 is digitally balanced in base 2, 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 not a de Polignac number, because 2540243 - 2⁶ = 2540179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2540249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66830 + ... + 66867.

It is an arithmetic number, because the mean of its divisors is an integer number (668490).

2^2540243 is an apocalyptic number.

2540243 is a deficient number, since it is larger than the sum of its proper divisors (133717).

2540243 is a wasteful number, since it uses less digits than its factorization.

2540243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133716.

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 2540243 is about 1593.8139791080. The cubic root of 2540243 is about 136.4452499055.

Adding to 2540243 its reverse (3420452), we get a palindrome (5960695).

The spelling of 2540243 in words is "two million, five hundred forty thousand, two hundred forty-three".