172723 has 4 divisors (see below), whose sum is σ = 174888. Its totient is φ = 170560.

The previous prime is 172721. The next prime is 172741. The reversal of 172723 is 327271.

172723 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 172723 - 2¹ = 172721 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 172694 and 172703.

It is not an unprimeable number, because it can be changed into a prime (172721) 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, 958 + ... + 1123.

It is an arithmetic number, because the mean of its divisors is an integer number (43722).

2¹⁷²⁷²³ is an apocalyptic number.

172723 is a deficient number, since it is larger than the sum of its proper divisors (2165).

172723 is an equidigital number, since it uses as much as digits as its factorization.

172723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2164.

The product of its digits is 588, while the sum is 22.

The square root of 172723 is about 415.5995668910. The cubic root of 172723 is about 55.6907915719.

Adding to 172723 its reverse (327271), we get a palindrome (499994).

The spelling of 172723 in words is "one hundred seventy-two thousand, seven hundred twenty-three", and thus it is an iban number.