168009138 has 24 divisors (see below), whose sum is σ = 397112976. Its totient is φ = 50911800.

The previous prime is 168009137. The next prime is 168009169. The reversal of 168009138 is 831900861.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (168009131) 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 11 ways as a sum of consecutive naturals, for example, 424068 + ... + 424463.

It is an arithmetic number, because the mean of its divisors is an integer number (16546374).

Almost surely, 2^168009138 is an apocalyptic number.

168009138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

168009138 is an abundant number, since it is smaller than the sum of its proper divisors (229103838).

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

168009138 is a wasteful number, since it uses less digits than its factorization.

168009138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 848550 (or 848547 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 168009138 is about 12961.8338980254. The cubic root of 168009138 is about 551.7948394794.

Adding to 168009138 its reverse (831900861), we get a palindrome (999909999).

The spelling of 168009138 in words is "one hundred sixty-eight million, nine thousand, one hundred thirty-eight".