842181 has 12 divisors (see below), whose sum is σ = 1157856. Its totient is φ = 544480.

The previous prime is 842173. The next prime is 842183. The reversal of 842181 is 181248.

It is not a de Polignac number, because 842181 - 2³ = 842173 is a prime.

It is a super-2 number, since 2×842181² = 1418537673522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (842183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4960 + ... + 5126.

It is an arithmetic number, because the mean of its divisors is an integer number (96488).

2⁸⁴²¹⁸¹ is an apocalyptic number.

It is an amenable number.

842181 is a deficient number, since it is larger than the sum of its proper divisors (315675).

842181 is a wasteful number, since it uses less digits than its factorization.

842181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252 (or 211 counting only the distinct ones).

The product of its digits is 512, while the sum is 24.

The square root of 842181 is about 917.7042007096. The cubic root of 842181 is about 94.4354700687.

The spelling of 842181 in words is "eight hundred forty-two thousand, one hundred eighty-one".