2540987 has 4 divisors (see below), whose sum is σ = 2544216. Its totient is φ = 2537760.

The previous prime is 2540983. The next prime is 2541001. The reversal of 2540987 is 7890452.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2540987 - 2² = 2540983 is a prime.

It is a super-2 number, since 2×2540987² = 12913229868338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2540981) 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, 428 + ... + 2294.

It is an arithmetic number, because the mean of its divisors is an integer number (636054).

2^2540987 is an apocalyptic number.

2540987 is a deficient number, since it is larger than the sum of its proper divisors (3229).

2540987 is a wasteful number, since it uses less digits than its factorization.

2540987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3228.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 2540987 is about 1594.0473644155. The cubic root of 2540987 is about 136.4585695442.

The spelling of 2540987 in words is "two million, five hundred forty thousand, nine hundred eighty-seven".