172123 has 8 divisors (see below), whose sum is σ = 200192. Its totient is φ = 144936.

The previous prime is 172097. The next prime is 172127. The reversal of 172123 is 321271.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 172123 - 2¹⁷ = 41051 is a prime.

It is a Duffinian number.

172123 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 172097 and 172106.

It is not an unprimeable number, because it can be changed into a prime (172127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 286 + ... + 652.

It is an arithmetic number, because the mean of its divisors is an integer number (25024).

2¹⁷²¹²³ is an apocalyptic number.

172123 is a deficient number, since it is larger than the sum of its proper divisors (28069).

172123 is an equidigital number, since it uses as much as digits as its factorization.

172123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441.

The product of its digits is 84, while the sum is 16.

The square root of 172123 is about 414.8770902328. The cubic root of 172123 is about 55.6262310884.

Adding to 172123 its reverse (321271), we get a palindrome (493394).

The spelling of 172123 in words is "one hundred seventy-two thousand, one hundred twenty-three", and thus it is an iban number.