399666338 has 8 divisors (see below), whose sum is σ = 613441488. Its totient is φ = 195185844.

The previous prime is 399666307. The next prime is 399666343. The reversal of 399666338 is 833666993.

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 399666338.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2323556 + ... + 2323727.

It is an arithmetic number, because the mean of its divisors is an integer number (76680186).

Almost surely, 2^399666338 is an apocalyptic number.

399666338 is a deficient number, since it is larger than the sum of its proper divisors (213775150).

399666338 is a wasteful number, since it uses less digits than its factorization.

399666338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4647328.

The product of its digits is 3779136, while the sum is 53.

The square root of 399666338 is about 19991.6567097377. The cubic root of 399666338 is about 736.6013725175.

It can be divided in two parts, 399666 and 338, that added together give a palindrome (400004).

The spelling of 399666338 in words is "three hundred ninety-nine million, six hundred sixty-six thousand, three hundred thirty-eight".