3661866 has 24 divisors (see below), whose sum is σ = 8544900. Its totient is φ = 1126656.

The previous prime is 3661841. The next prime is 3661871. The reversal of 3661866 is 6681663.

3661866 is a `hidden beast` number, since 36 + 618 + 6 + 6 = 666.

3661866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 3164841 + 497025 = 1779^2 + 705^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3661866.

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 11 ways as a sum of consecutive naturals, for example, 7591 + ... + 8058.

Almost surely, 2^3661866 is an apocalyptic number.

3661866 is an abundant number, since it is smaller than the sum of its proper divisors (4883034).

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

3661866 is a wasteful number, since it uses less digits than its factorization.

3661866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15670 (or 15667 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 3661866 is about 1913.6002717391. The cubic root of 3661866 is about 154.1348400172.

The spelling of 3661866 in words is "three million, six hundred sixty-one thousand, eight hundred sixty-six".