39999866 has 8 divisors (see below), whose sum is σ = 60026880. Its totient is φ = 19990908.

The previous prime is 39999863. The next prime is 39999899. The reversal of 39999866 is 66899993.

It is a happy number.

39999866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not an unprimeable number, because it can be changed into a prime (39999863) by changing a digit.

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, 5255 + ... + 10373.

It is an arithmetic number, because the mean of its divisors is an integer number (7503360).

Almost surely, 2^39999866 is an apocalyptic number.

39999866 is a deficient number, since it is larger than the sum of its proper divisors (20027014).

39999866 is a wasteful number, since it uses less digits than its factorization.

39999866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9028.

The product of its digits is 5668704, while the sum is 59.

The square root of 39999866 is about 6324.5447266977. The cubic root of 39999866 is about 341.9948074403.

The spelling of 39999866 in words is "thirty-nine million, nine hundred ninety-nine thousand, eight hundred sixty-six".