2540866 has 4 divisors (see below), whose sum is σ = 3811302. Its totient is φ = 1270432.

The previous prime is 2540849. The next prime is 2540869. The reversal of 2540866 is 6680452.

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., 1782225 + 758641 = 1335^2 + 871^2 .

It is not an unprimeable number, because it can be changed into a prime (2540869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 635215 + ... + 635218.

2^2540866 is an apocalyptic number.

2540866 is a deficient number, since it is larger than the sum of its proper divisors (1270436).

2540866 is a wasteful number, since it uses less digits than its factorization.

2540866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1270435.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 2540866 is about 1594.0094102608. The cubic root of 2540866 is about 136.4564034897.

The spelling of 2540866 in words is "two million, five hundred forty thousand, eight hundred sixty-six".