168231986 has 16 divisors (see below), whose sum is σ = 272025600. Its totient is φ = 77569488.

The previous prime is 168231971. The next prime is 168231989. The reversal of 168231986 is 689132861.

It is a super-2 number, since 2×168231986² = 56604002227008392, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (168231989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30725 + ... + 35783.

It is an arithmetic number, because the mean of its divisors is an integer number (17001600).

Almost surely, 2^168231986 is an apocalyptic number.

168231986 is a deficient number, since it is larger than the sum of its proper divisors (103793614).

168231986 is a wasteful number, since it uses less digits than its factorization.

168231986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6353.

The product of its digits is 124416, while the sum is 44.

The square root of 168231986 is about 12970.4273638150. The cubic root of 168231986 is about 552.0386993277.

The spelling of 168231986 in words is "one hundred sixty-eight million, two hundred thirty-one thousand, nine hundred eighty-six".