168138727 has 4 divisors (see below), whose sum is σ = 168607440. Its totient is φ = 167670016.

The previous prime is 168138697. The next prime is 168138739. The reversal of 168138727 is 727831861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 727831861 = 16651 ⋅43711.

It is a cyclic number.

It is not a de Polignac number, because 168138727 - 2¹⁹ = 167614439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168138757) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 233818 + ... + 234535.

It is an arithmetic number, because the mean of its divisors is an integer number (42151860).

Almost surely, 2^168138727 is an apocalyptic number.

168138727 is a deficient number, since it is larger than the sum of its proper divisors (468713).

168138727 is an equidigital number, since it uses as much as digits as its factorization.

168138727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468712.

The product of its digits is 112896, while the sum is 43.

The square root of 168138727 is about 12966.8318027188. The cubic root of 168138727 is about 551.9366733609.

The spelling of 168138727 in words is "one hundred sixty-eight million, one hundred thirty-eight thousand, seven hundred twenty-seven".