2540666 has 4 divisors (see below), whose sum is σ = 3811002. Its totient is φ = 1270332.

The previous prime is 2540663. The next prime is 2540677. The reversal of 2540666 is 6660452.

2540666 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 can be written as a sum of positive squares in only one way, i.e., 1510441 + 1030225 = 1229^2 + 1015^2 .

It is not an unprimeable number, because it can be changed into a prime (2540663) 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 as a sum of consecutive naturals, namely, 635165 + ... + 635168.

2^2540666 is an apocalyptic number.

2540666 is a deficient number, since it is larger than the sum of its proper divisors (1270336).

2540666 is a wasteful number, since it uses less digits than its factorization.

2540666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1270335.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 2540666 is about 1593.9466741394. The cubic root of 2540666 is about 136.4528230836.

The spelling of 2540666 in words is "two million, five hundred forty thousand, six hundred sixty-six".