2540540 has 24 divisors (see below), whose sum is σ = 5428080. Its totient is φ = 998528.

The previous prime is 2540539. The next prime is 2540563. The reversal of 2540540 is 450452.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

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, 104 + ... + 2256.

It is an arithmetic number, because the mean of its divisors is an integer number (226170).

2^2540540 is an apocalyptic number.

2540540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2540540 is an abundant number, since it is smaller than the sum of its proper divisors (2887540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2540540 is a wasteful number, since it uses less digits than its factorization.

2540540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2221 (or 2219 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 20.

The square root of 2540540 is about 1593.9071491150. The cubic root of 2540540 is about 136.4505673312.

Adding to 2540540 its reverse (450452), we get a palindrome (2990992).

The spelling of 2540540 in words is "two million, five hundred forty thousand, five hundred forty".