1686438168 has 32 divisors (see below), whose sum is σ = 4220923200. Its totient is φ = 561502368.

The previous prime is 1686438167. The next prime is 1686438181. The reversal of 1686438168 is 8618346861.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1686438168.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1686438167) 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, 18598 + ... + 60981.

It is an arithmetic number, because the mean of its divisors is an integer number (131903850).

Almost surely, 2^1686438168 is an apocalyptic number.

It is an amenable number.

1686438168 is an abundant number, since it is smaller than the sum of its proper divisors (2534485032).

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

1686438168 is a wasteful number, since it uses less digits than its factorization.

1686438168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80471 (or 80467 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 51.

The square root of 1686438168 is about 41066.2655716343. The cubic root of 1686438168 is about 1190.3010249920.

The spelling of 1686438168 in words is "one billion, six hundred eighty-six million, four hundred thirty-eight thousand, one hundred sixty-eight".