3805866 has 48 divisors (see below), whose sum is σ = 8805888. Its totient is φ = 1231200.

The previous prime is 3805861. The next prime is 3805889. The reversal of 3805866 is 6685083.

It is a self number, because there is not a number n which added to its sum of digits gives 3805866.

It is not an unprimeable number, because it can be changed into a prime (3805861) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19831 + ... + 20021.

It is an arithmetic number, because the mean of its divisors is an integer number (183456).

Almost surely, 2^3805866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3805866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4402944).

3805866 is an abundant number, since it is smaller than the sum of its proper divisors (5000022).

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

3805866 is a wasteful number, since it uses less digits than its factorization.

3805866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249 (or 237 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 3805866 is about 1950.8628860071. The cubic root of 3805866 is about 156.1293306196.

The spelling of 3805866 in words is "three million, eight hundred five thousand, eight hundred sixty-six".