399666854 has 8 divisors (see below), whose sum is σ = 613442280. Its totient is φ = 195186096.

The previous prime is 399666853. The next prime is 399666857. The reversal of 399666854 is 458666993.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 399666854.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399666851) by changing a digit.

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, 2323559 + ... + 2323730.

It is an arithmetic number, because the mean of its divisors is an integer number (76680285).

Almost surely, 2^399666854 is an apocalyptic number.

399666854 is a deficient number, since it is larger than the sum of its proper divisors (213775426).

399666854 is a wasteful number, since it uses less digits than its factorization.

399666854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4647334.

The product of its digits is 8398080, while the sum is 56.

The square root of 399666854 is about 19991.6696151172. The cubic root of 399666854 is about 736.6016895204.

The spelling of 399666854 in words is "three hundred ninety-nine million, six hundred sixty-six thousand, eight hundred fifty-four".