3866 has 4 divisors (see below), whose sum is σ = 5802. Its totient is φ = 1932.

The previous prime is 3863. The next prime is 3877. The reversal of 3866 is 6683.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6683 = 41 ⋅163.

It can be written as a sum of positive squares in only one way, i.e., 3025 + 841 = 55^2 + 29^2 .

3866 is a modest number, since divided by 66 gives 38 as remainder.

It is a plaindrome in base 15.

It is a nialpdrome in base 8.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 3866.

It is not an unprimeable number, because it can be changed into a prime (3863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 965 + ... + 968.

3866 is a deficient number, since it is larger than the sum of its proper divisors (1936).

3866 is a wasteful number, since it uses less digits than its factorization.

3866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1935.

The product of its digits is 864, while the sum is 23.

The square root of 3866 is about 62.1771662268. The cubic root of 3866 is about 15.6947336523.

The spelling of 3866 in words is "three thousand, eight hundred sixty-six".