172842 has 8 divisors (see below), whose sum is σ = 345696. Its totient is φ = 57612.

The previous prime is 172829. The next prime is 172849. The reversal of 172842 is 248271.

172842 is nontrivially palindromic in base 4.

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

172842 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (172849) 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, 14398 + ... + 14409.

It is an arithmetic number, because the mean of its divisors is an integer number (43212).

2¹⁷²⁸⁴² is an apocalyptic number.

172842 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

172842 is a wasteful number, since it uses less digits than its factorization.

172842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28812.

The product of its digits is 896, while the sum is 24.

The square root of 172842 is about 415.7427088958. The cubic root of 172842 is about 55.7035782936.

It can be divided in two parts, 1728 and 42, that added together give a triangular number (1770 = T₅₉).

The spelling of 172842 in words is "one hundred seventy-two thousand, eight hundred forty-two".