3921878866 has 8 divisors (see below), whose sum is σ = 5912380800. Its totient is φ = 1951085268.

The previous prime is 3921878843. The next prime is 3921878893. The reversal of 3921878866 is 6688781293.

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

It is a super-2 number, since 2×3921878866² = 30762267679154891912, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3921878866.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4926586 + ... + 4927381.

It is an arithmetic number, because the mean of its divisors is an integer number (739047600).

Almost surely, 2^3921878866 is an apocalyptic number.

3921878866 is a deficient number, since it is larger than the sum of its proper divisors (1990501934).

3921878866 is a wasteful number, since it uses less digits than its factorization.

3921878866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9854168.

The product of its digits is 6967296, while the sum is 58.

The square root of 3921878866 is about 62624.9061156981. The cubic root of 3921878866 is about 1576.9989053426.

The spelling of 3921878866 in words is "three billion, nine hundred twenty-one million, eight hundred seventy-eight thousand, eight hundred sixty-six".