2540523 has 4 divisors (see below), whose sum is σ = 3387368. Its totient is φ = 1693680.

The previous prime is 2540519. The next prime is 2540533. The reversal of 2540523 is 3250452.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2540523 - 2² = 2540519 is a prime.

It is a super-2 number, since 2×2540523² = 12908514227058, which contains 22 as substring.

It is a D-number.

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 2540523.

It is not an unprimeable number, because it can be changed into a prime (2540513) 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, 423418 + ... + 423423.

It is an arithmetic number, because the mean of its divisors is an integer number (846842).

2^2540523 is an apocalyptic number.

2540523 is a deficient number, since it is larger than the sum of its proper divisors (846845).

2540523 is an equidigital number, since it uses as much as digits as its factorization.

2540523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 846844.

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 2540523 is about 1593.9018162986. The cubic root of 2540523 is about 136.4502629780.

Adding to 2540523 its reverse (3250452), we get a palindrome (5790975).

The spelling of 2540523 in words is "two million, five hundred forty thousand, five hundred twenty-three".