871540 has 12 divisors (see below), whose sum is σ = 1830276. Its totient is φ = 348608.

The previous prime is 871531. The next prime is 871553. The reversal of 871540 is 45178.

871540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 266256 + 605284 = 516^2 + 778^2 .

It is a plaindrome in base 15.

It is a congruent number.

It is an unprimeable number.

871540 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, 21769 + ... + 21808.

It is an arithmetic number, because the mean of its divisors is an integer number (152523).

2⁸⁷¹⁵⁴⁰ is an apocalyptic number.

It is an amenable number.

871540 is an abundant number, since it is smaller than the sum of its proper divisors (958736).

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

871540 is a wasteful number, since it uses less digits than its factorization.

871540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43586 (or 43584 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 871540 is about 933.5630669644. The cubic root of 871540 is about 95.5203213245.

The spelling of 871540 in words is "eight hundred seventy-one thousand, five hundred forty".