2605866 has 8 divisors (see below), whose sum is σ = 5211744. Its totient is φ = 868620.

The previous prime is 2605849. The next prime is 2605871. The reversal of 2605866 is 6685062.

2605866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

2605866 is an admirable number.

It is an unprimeable number.

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, 217150 + ... + 217161.

It is an arithmetic number, because the mean of its divisors is an integer number (651468).

2^2605866 is an apocalyptic number.

2605866 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2605866 is a wasteful number, since it uses less digits than its factorization.

2605866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434316.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 2605866 is about 1614.2694942295. The cubic root of 2605866 is about 137.6102212639.

The spelling of 2605866 in words is "two million, six hundred five thousand, eight hundred sixty-six".