3997399866 has 16 divisors (see below), whose sum is σ = 8004453600. Its totient is φ = 1330857648.

The previous prime is 3997399849. The next prime is 3997399877. The reversal of 3997399866 is 6689937993.

It is a self number, because there is not a number n which added to its sum of digits gives 3997399866.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 396856 + ... + 406803.

It is an arithmetic number, because the mean of its divisors is an integer number (500278350).

Almost surely, 2^3997399866 is an apocalyptic number.

3997399866 is an abundant number, since it is smaller than the sum of its proper divisors (4007053734).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3997399866 is a wasteful number, since it uses less digits than its factorization.

3997399866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804493.

The product of its digits is 119042784, while the sum is 69.

The square root of 3997399866 is about 63224.9939976272. The cubic root of 3997399866 is about 1587.0570227934.

The spelling of 3997399866 in words is "three billion, nine hundred ninety-seven million, three hundred ninety-nine thousand, eight hundred sixty-six".