3978866 has 8 divisors (see below), whose sum is σ = 6282480. Its totient is φ = 1884708.

The previous prime is 3978859. The next prime is 3978883. The reversal of 3978866 is 6688793.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 3978866.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52316 + ... + 52391.

It is an arithmetic number, because the mean of its divisors is an integer number (785310).

Almost surely, 2^3978866 is an apocalyptic number.

3978866 is a deficient number, since it is larger than the sum of its proper divisors (2303614).

3978866 is a wasteful number, since it uses less digits than its factorization.

3978866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104728.

The product of its digits is 435456, while the sum is 47.

The square root of 3978866 is about 1994.7095026595. The cubic root of 3978866 is about 158.4600435991.

The spelling of 3978866 in words is "three million, nine hundred seventy-eight thousand, eight hundred sixty-six".