3813866 has 12 divisors (see below), whose sum is σ = 6654978. Its totient is φ = 1634472.

The previous prime is 3813847. The next prime is 3813869. The reversal of 3813866 is 6683183.

It is a happy number.

3813866 is digitally balanced in base 8, 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 only one way, i.e., 3705625 + 108241 = 1925^2 + 329^2 .

It is an Ulam number.

3813866 is strictly pandigital in base 8.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3813869) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19361 + ... + 19556.

Almost surely, 2^3813866 is an apocalyptic number.

3813866 is a deficient number, since it is larger than the sum of its proper divisors (2841112).

3813866 is a wasteful number, since it uses less digits than its factorization.

3813866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38933 (or 38926 counting only the distinct ones).

The product of its digits is 20736, while the sum is 35.

The square root of 3813866 is about 1952.9121844056. The cubic root of 3813866 is about 156.2386496288.

The spelling of 3813866 in words is "three million, eight hundred thirteen thousand, eight hundred sixty-six".