168138586 has 16 divisors (see below), whose sum is σ = 314441280. Its totient is φ = 65508480.

The previous prime is 168138563. The next prime is 168138589. The reversal of 168138586 is 685831861.

It is not an unprimeable number, because it can be changed into a prime (168138589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 545751 + ... + 546058.

It is an arithmetic number, because the mean of its divisors is an integer number (19652580).

Almost surely, 2^168138586 is an apocalyptic number.

168138586 is a deficient number, since it is larger than the sum of its proper divisors (146302694).

168138586 is a wasteful number, since it uses less digits than its factorization.

168138586 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1091829.

The product of its digits is 276480, while the sum is 46.

The square root of 168138586 is about 12966.8263657689. The cubic root of 168138586 is about 551.9365190774.

The spelling of 168138586 in words is "one hundred sixty-eight million, one hundred thirty-eight thousand, five hundred eighty-six".