2540642 has 32 divisors (see below), whose sum is σ = 4468800. Its totient is φ = 1073088.

The previous prime is 2540641. The next prime is 2540663. The reversal of 2540642 is 2460452.

It is not an unprimeable number, because it can be changed into a prime (2540641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18209 + ... + 18347.

It is an arithmetic number, because the mean of its divisors is an integer number (139650).

2^2540642 is an apocalyptic number.

2540642 is a deficient number, since it is larger than the sum of its proper divisors (1928158).

2540642 is a wasteful number, since it uses less digits than its factorization.

2540642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 2540642 is about 1593.9391456389. The cubic root of 2540642 is about 136.4523934222.

The spelling of 2540642 in words is "two million, five hundred forty thousand, six hundred forty-two".