842089 has 2 divisors, whose sum is σ = 842090. Its totient is φ = 842088.

The previous prime is 842087. The next prime is 842111. The reversal of 842089 is 980248.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 652864 + 189225 = 808^2 + 435^2 .

It is a cyclic number.

It is not a de Polignac number, because 842089 - 2¹ = 842087 is a prime.

It is a super-2 number, since 2×842089² = 1418227767842, which contains 22 as substring.

Together with 842087, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 842089.

It is not a weakly prime, because it can be changed into another prime (842081) 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 as a sum of consecutive naturals, namely, 421044 + 421045.

It is an arithmetic number, because the mean of its divisors is an integer number (421045).

2⁸⁴²⁰⁸⁹ is an apocalyptic number.

It is an amenable number.

842089 is a deficient number, since it is larger than the sum of its proper divisors (1).

842089 is an equidigital number, since it uses as much as digits as its factorization.

842089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 842089 is about 917.6540742567. The cubic root of 842089 is about 94.4320312277.

The spelling of 842089 in words is "eight hundred forty-two thousand, eighty-nine".