871940 has 12 divisors (see below), whose sum is σ = 1831116. Its totient is φ = 348768.

The previous prime is 871931. The next prime is 871957. The reversal of 871940 is 49178.

It can be written as a sum of positive squares in 2 ways, for example, as 111556 + 760384 = 334^2 + 872^2 .

It is a congruent number.

It is an unprimeable number.

871940 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21779 + ... + 21818.

It is an arithmetic number, because the mean of its divisors is an integer number (152593).

2⁸⁷¹⁹⁴⁰ is an apocalyptic number.

It is an amenable number.

871940 is an abundant number, since it is smaller than the sum of its proper divisors (959176).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

871940 is a wasteful number, since it uses less digits than its factorization.

871940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43606 (or 43604 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 871940 is about 933.7772753714. Note that the first 3 decimals coincide. The cubic root of 871940 is about 95.5349323520.

The spelling of 871940 in words is "eight hundred seventy-one thousand, nine hundred forty".