842172 has 12 divisors (see below), whose sum is σ = 1965096. Its totient is φ = 280720.

The previous prime is 842167. The next prime is 842173. The reversal of 842172 is 271248.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (842173) by changing a digit.

842172 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35079 + ... + 35102.

It is an arithmetic number, because the mean of its divisors is an integer number (163758).

2⁸⁴²¹⁷² is an apocalyptic number.

It is an amenable number.

842172 is an abundant number, since it is smaller than the sum of its proper divisors (1122924).

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

842172 is a wasteful number, since it uses less digits than its factorization.

842172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70188 (or 70186 counting only the distinct ones).

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

The square root of 842172 is about 917.6992971557. The cubic root of 842172 is about 94.4351336714.

The spelling of 842172 in words is "eight hundred forty-two thousand, one hundred seventy-two".