3866663 has 4 divisors (see below), whose sum is σ = 3879408. Its totient is φ = 3853920.

The previous prime is 3866651. The next prime is 3866713. The reversal of 3866663 is 3666683.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3666683 = 23 ⋅159421.

It is a cyclic number.

It is not a de Polignac number, because 3866663 - 2⁴ = 3866647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3866623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5906 + ... + 6527.

It is an arithmetic number, because the mean of its divisors is an integer number (969852).

Almost surely, 2^3866663 is an apocalyptic number.

3866663 is a deficient number, since it is larger than the sum of its proper divisors (12745).

3866663 is a wasteful number, since it uses less digits than its factorization.

3866663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12744.

The product of its digits is 93312, while the sum is 38.

The square root of 3866663 is about 1966.3832281628. The cubic root of 3866663 is about 156.9563079090.

The spelling of 3866663 in words is "three million, eight hundred sixty-six thousand, six hundred sixty-three".