168745 has 4 divisors (see below), whose sum is σ = 202500. Its totient is φ = 134992.

The previous prime is 168743. The next prime is 168761. The reversal of 168745 is 547861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 547861 = 53 ⋅10337.

It can be written as a sum of positive squares in 2 ways, for example, as 114921 + 53824 = 339^2 + 232^2 .

It is a cyclic number.

It is not a de Polignac number, because 168745 - 2¹ = 168743 is a prime.

It is a Smith number, since the sum of its digits (31) 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 (168743) 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, 16870 + ... + 16879.

It is an arithmetic number, because the mean of its divisors is an integer number (50625).

2¹⁶⁸⁷⁴⁵ is an apocalyptic number.

It is an amenable number.

168745 is a deficient number, since it is larger than the sum of its proper divisors (33755).

168745 is an equidigital number, since it uses as much as digits as its factorization.

168745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33754.

The product of its digits is 6720, while the sum is 31.

The square root of 168745 is about 410.7858322776. The cubic root of 168745 is about 55.2599266918.

The spelling of 168745 in words is "one hundred sixty-eight thousand, seven hundred forty-five".