842447 has 2 divisors, whose sum is σ = 842448. Its totient is φ = 842446.

The previous prime is 842423. The next prime is 842449. The reversal of 842447 is 744248.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 842447 - 2⁶ = 842383 is a prime.

Together with 842449, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 842447.

It is not a weakly prime, because it can be changed into another prime (842449) 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, 421223 + 421224.

It is an arithmetic number, because the mean of its divisors is an integer number (421224).

2⁸⁴²⁴⁴⁷ is an apocalyptic number.

842447 is a deficient number, since it is larger than the sum of its proper divisors (1).

842447 is an equidigital number, since it uses as much as digits as its factorization.

842447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7168, while the sum is 29.

The square root of 842447 is about 917.8491161406. The cubic root of 842447 is about 94.4454113960.

The spelling of 842447 in words is "eight hundred forty-two thousand, four hundred forty-seven".