172242 has 24 divisors (see below), whose sum is σ = 426816. Its totient is φ = 49176.

The previous prime is 172223. The next prime is 172243. The reversal of 172242 is 242271.

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

It is not an unprimeable number, because it can be changed into a prime (172243) by changing a digit.

172242 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 11 ways as a sum of consecutive naturals, for example, 558 + ... + 809.

It is an arithmetic number, because the mean of its divisors is an integer number (17784).

2¹⁷²²⁴² is an apocalyptic number.

172242 is an abundant number, since it is smaller than the sum of its proper divisors (254574).

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

172242 is a wasteful number, since it uses less digits than its factorization.

172242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1382 (or 1379 counting only the distinct ones).

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

The square root of 172242 is about 415.0204814223. The cubic root of 172242 is about 55.6390474979.

It can be divided in two parts, 1722 and 42, that added together give a square (1764 = 42²).

The spelling of 172242 in words is "one hundred seventy-two thousand, two hundred forty-two", and thus it is an iban number.