168709 has 4 divisors (see below), whose sum is σ = 170316. Its totient is φ = 167104.

The previous prime is 168697. The next prime is 168713. The reversal of 168709 is 907861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 907861 = 109 ⋅8329.

It can be written as a sum of positive squares in 2 ways, for example, as 65025 + 103684 = 255^2 + 322^2 .

It is a cyclic number.

It is not a de Polignac number, because 168709 - 2⁵ = 168677 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 634 + ... + 859.

It is an arithmetic number, because the mean of its divisors is an integer number (42579).

2¹⁶⁸⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

168709 is a deficient number, since it is larger than the sum of its proper divisors (1607).

168709 is a wasteful number, since it uses less digits than its factorization.

168709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1606.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 168709 is about 410.7420114865. The cubic root of 168709 is about 55.2559967011.

The spelling of 168709 in words is "one hundred sixty-eight thousand, seven hundred nine".