842905 has 8 divisors (see below), whose sum is σ = 1156032. Its totient is φ = 577968.

The previous prime is 842887. The next prime is 842923. The reversal of 842905 is 509248.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (842887) and next prime (842923).

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

It is a cyclic number.

It is not a de Polignac number, because 842905 - 2⁹ = 842393 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 12007 + ... + 12076.

It is an arithmetic number, because the mean of its divisors is an integer number (144504).

2⁸⁴²⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

842905 is a deficient number, since it is larger than the sum of its proper divisors (313127).

842905 is a wasteful number, since it uses less digits than its factorization.

842905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24095.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 842905 is about 918.0985785851. The cubic root of 842905 is about 94.4625235158.

The spelling of 842905 in words is "eight hundred forty-two thousand, nine hundred five".