842009 has 8 divisors (see below), whose sum is σ = 988608. Its totient is φ = 702000.

The previous prime is 842003. The next prime is 842021. The reversal of 842009 is 900248.

842009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-842009 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (842003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1367 + ... + 1884.

It is an arithmetic number, because the mean of its divisors is an integer number (123576).

2⁸⁴²⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

842009 is a deficient number, since it is larger than the sum of its proper divisors (146599).

842009 is a wasteful number, since it uses less digits than its factorization.

842009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3295.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 842009 is about 917.6104838111. The cubic root of 842009 is about 94.4290407276.

The spelling of 842009 in words is "eight hundred forty-two thousand, nine".