871849 has 4 divisors (see below), whose sum is σ = 951120. Its totient is φ = 792580.

The previous prime is 871837. The next prime is 871867. The reversal of 871849 is 948178.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 871849 - 2⁵ = 871817 is a prime.

It is a Duffinian number.

871849 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (871249) 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, 39619 + ... + 39640.

It is an arithmetic number, because the mean of its divisors is an integer number (237780).

2⁸⁷¹⁸⁴⁹ is an apocalyptic number.

It is an amenable number.

871849 is a deficient number, since it is larger than the sum of its proper divisors (79271).

871849 is a wasteful number, since it uses less digits than its factorization.

871849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79270.

The product of its digits is 16128, while the sum is 37.

The square root of 871849 is about 933.7285472770. The cubic root of 871849 is about 95.5316087360.

It can be divided in two parts, 87 and 1849, that added together give a square (1936 = 44²).

The spelling of 871849 in words is "eight hundred seventy-one thousand, eight hundred forty-nine".