891853 has 4 divisors (see below), whose sum is σ = 896668. Its totient is φ = 887040.

The previous prime is 891851. The next prime is 891859. The reversal of 891853 is 358198.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 358198 = 2 ⋅179099.

It can be written as a sum of positive squares in 2 ways, for example, as 272484 + 619369 = 522^2 + 787^2 .

It is a cyclic number.

It is not a de Polignac number, because 891853 - 2¹ = 891851 is a prime.

It is a Duffinian number.

891853 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2118 + ... + 2503.

It is an arithmetic number, because the mean of its divisors is an integer number (224167).

2⁸⁹¹⁸⁵³ is an apocalyptic number.

It is an amenable number.

891853 is a deficient number, since it is larger than the sum of its proper divisors (4815).

891853 is a wasteful number, since it uses less digits than its factorization.

891853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4814.

The product of its digits is 8640, while the sum is 34.

The square root of 891853 is about 944.3796905906. The cubic root of 891853 is about 96.2567274771.

The spelling of 891853 in words is "eight hundred ninety-one thousand, eight hundred fifty-three".