842423 has 2 divisors, whose sum is σ = 842424. Its totient is φ = 842422.

The previous prime is 842419. The next prime is 842447. The reversal of 842423 is 324248.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 842423 - 2² = 842419 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (842473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421211 + 421212.

It is an arithmetic number, because the mean of its divisors is an integer number (421212).

2⁸⁴²⁴²³ is an apocalyptic number.

842423 is a deficient number, since it is larger than the sum of its proper divisors (1).

842423 is an equidigital number, since it uses as much as digits as its factorization.

842423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1536, while the sum is 23.

The square root of 842423 is about 917.8360420031. The cubic root of 842423 is about 94.4445145200. Note that the first 3 decimals are identical.

The spelling of 842423 in words is "eight hundred forty-two thousand, four hundred twenty-three".