123172 has 24 divisors (see below), whose sum is σ = 254016. Its totient is φ = 51168.

The previous prime is 123169. The next prime is 123191. The reversal of 123172 is 271321.

It is a happy number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1443 + ... + 1525.

It is an arithmetic number, because the mean of its divisors is an integer number (10584).

2¹²³¹⁷² is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127008).

123172 is an abundant number, since it is smaller than the sum of its proper divisors (130844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123172 is a wasteful number, since it uses less digits than its factorization.

123172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147 (or 145 counting only the distinct ones).

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

The square root of 123172 is about 350.9586870274. The cubic root of 123172 is about 49.7550688000.

Adding to 123172 its product of digits (84), we get a triangular number (123256 = T₄₉₆).

Adding to 123172 its reverse (271321), we get a palindrome (394493).

The spelling of 123172 in words is "one hundred twenty-three thousand, one hundred seventy-two", and thus it is an iban number.