172422 has 32 divisors (see below), whose sum is σ = 399360. Its totient is φ = 55080.

The previous prime is 172421. The next prime is 172423. The reversal of 172422 is 224271.

It is an interprime number because it is at equal distance from previous prime (172421) and next prime (172423).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 172395 and 172404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172421) 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 15 ways as a sum of consecutive naturals, for example, 1623 + ... + 1725.

It is an arithmetic number, because the mean of its divisors is an integer number (12480).

2¹⁷²⁴²² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172422, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (199680).

172422 is an abundant number, since it is smaller than the sum of its proper divisors (226938).

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

172422 is a wasteful number, since it uses less digits than its factorization.

172422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145 (or 139 counting only the distinct ones).

The product of its digits is 224, while the sum is 18.

The square root of 172422 is about 415.2372815632. The cubic root of 172422 is about 55.6584224507.

Adding to 172422 its reverse (224271), we get a palindrome (396693).

The spelling of 172422 in words is "one hundred seventy-two thousand, four hundred twenty-two", and thus it is an iban number.