842891 has 4 divisors (see below), whose sum is σ = 963312. Its totient is φ = 722472.

The previous prime is 842887. The next prime is 842923. The reversal of 842891 is 198248.

842891 = 344² + 345² + ... + 350².

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 842891 - 2² = 842887 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 842891.

It is not an unprimeable number, because it can be changed into a prime (842801) 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 in 3 ways as a sum of consecutive naturals, for example, 60200 + ... + 60213.

It is an arithmetic number, because the mean of its divisors is an integer number (240828).

2⁸⁴²⁸⁹¹ is an apocalyptic number.

842891 is a deficient number, since it is larger than the sum of its proper divisors (120421).

842891 is a wasteful number, since it uses less digits than its factorization.

842891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120420.

The product of its digits is 4608, while the sum is 32.

The square root of 842891 is about 918.0909540999. The cubic root of 842891 is about 94.4620005297.

The spelling of 842891 in words is "eight hundred forty-two thousand, eight hundred ninety-one".