391606168 has 16 divisors (see below), whose sum is σ = 734987880. Its totient is φ = 195609408.

The previous prime is 391606147. The next prime is 391606177. The reversal of 391606168 is 861606193.

It is a self number, because there is not a number n which added to its sum of digits gives 391606168.

It is a congruent number.

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, 15430 + ... + 31957.

Almost surely, 2^391606168 is an apocalyptic number.

It is an amenable number.

391606168 is a deficient number, since it is larger than the sum of its proper divisors (343381712).

391606168 is a wasteful number, since it uses less digits than its factorization.

391606168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48426 (or 48422 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 391606168 is about 19789.0416139842. The cubic root of 391606168 is about 731.6159660548.

The spelling of 391606168 in words is "three hundred ninety-one million, six hundred six thousand, one hundred sixty-eight".