2540387 has 4 divisors (see below), whose sum is σ = 2548056. Its totient is φ = 2532720.

The previous prime is 2540341. The next prime is 2540389. The reversal of 2540387 is 7830452.

It is a happy number.

2540387 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 2540387 - 2⁶ = 2540323 is a prime.

It is a super-2 number, since 2×2540387² = 12907132219538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2540389) 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, 3314 + ... + 4007.

It is an arithmetic number, because the mean of its divisors is an integer number (637014).

2^2540387 is an apocalyptic number.

2540387 is a deficient number, since it is larger than the sum of its proper divisors (7669).

2540387 is an equidigital number, since it uses as much as digits as its factorization.

2540387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7668.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 2540387 is about 1593.8591531249. The cubic root of 2540387 is about 136.4478281031.

The spelling of 2540387 in words is "two million, five hundred forty thousand, three hundred eighty-seven".