827891 has 4 divisors (see below), whose sum is σ = 834072. Its totient is φ = 821712.

The previous prime is 827873. The next prime is 827899. The reversal of 827891 is 198728.

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 827891 - 2¹⁰ = 826867 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (827899) 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, 2885 + ... + 3158.

It is an arithmetic number, because the mean of its divisors is an integer number (208518).

2⁸²⁷⁸⁹¹ is an apocalyptic number.

827891 is a deficient number, since it is larger than the sum of its proper divisors (6181).

827891 is a wasteful number, since it uses less digits than its factorization.

827891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6180.

The product of its digits is 8064, while the sum is 35.

The square root of 827891 is about 909.8851575886. The cubic root of 827891 is about 93.8982980324.

The spelling of 827891 in words is "eight hundred twenty-seven thousand, eight hundred ninety-one".