842123 has 4 divisors (see below), whose sum is σ = 854760. Its totient is φ = 829488.

The previous prime is 842113. The next prime is 842141. The reversal of 842123 is 321248.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 842123 - 2¹⁴ = 825739 is a prime.

It is a super-2 number, since 2×842123² = 1418342294258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 842095 and 842104.

It is not an unprimeable number, because it can be changed into a prime (842113) 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 3 ways as a sum of consecutive naturals, for example, 6218 + ... + 6351.

It is an arithmetic number, because the mean of its divisors is an integer number (213690).

2⁸⁴²¹²³ is an apocalyptic number.

842123 is a deficient number, since it is larger than the sum of its proper divisors (12637).

842123 is a wasteful number, since it uses less digits than its factorization.

842123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12636.

The product of its digits is 384, while the sum is 20.

The square root of 842123 is about 917.6725995691. The cubic root of 842123 is about 94.4333021329.

The spelling of 842123 in words is "eight hundred forty-two thousand, one hundred twenty-three".