399818668 has 6 divisors (see below), whose sum is σ = 699682676. Its totient is φ = 199909332.

The previous prime is 399818663. The next prime is 399818677. The reversal of 399818668 is 866818993.

It is not an unprimeable number, because it can be changed into a prime (399818663) by changing a digit.

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 as a sum of consecutive naturals, namely, 49977330 + ... + 49977337.

Almost surely, 2^399818668 is an apocalyptic number.

It is an amenable number.

399818668 is a deficient number, since it is larger than the sum of its proper divisors (299864008).

399818668 is a wasteful number, since it uses less digits than its factorization.

399818668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99954671 (or 99954669 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 58.

The square root of 399818668 is about 19995.4661861133. The cubic root of 399818668 is about 736.6949440995.

The spelling of 399818668 in words is "three hundred ninety-nine million, eight hundred eighteen thousand, six hundred sixty-eight".