399666168 has 96 divisors (see below), whose sum is σ = 1221620400. Its totient is φ = 116928000.

The previous prime is 399666133. The next prime is 399666173. The reversal of 399666168 is 861666993.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14268 + ... + 31668.

Almost surely, 2^399666168 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399666168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (610810200).

399666168 is an abundant number, since it is smaller than the sum of its proper divisors (821954232).

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

399666168 is a wasteful number, since it uses less digits than its factorization.

399666168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17453 (or 17446 counting only the distinct ones).

The product of its digits is 2519424, while the sum is 54.

The square root of 399666168 is about 19991.6524579635. The cubic root of 399666168 is about 736.6012680785.

The spelling of 399666168 in words is "three hundred ninety-nine million, six hundred sixty-six thousand, one hundred sixty-eight".