871040 has 32 divisors (see below), whose sum is σ = 2083860. Its totient is φ = 348160.

The previous prime is 871037. The next prime is 871061. The reversal of 871040 is 40178.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 817216 + 53824 = 904^2 + 232^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41 + ... + 1320.

2⁸⁷¹⁰⁴⁰ is an apocalyptic number.

871040 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 871040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1041930).

871040 is an abundant number, since it is smaller than the sum of its proper divisors (1212820).

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

871040 is a wasteful number, since it uses less digits than its factorization.

871040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1380 (or 1368 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 871040 is about 933.2952373178. The cubic root of 871040 is about 95.5020512520.

The spelling of 871040 in words is "eight hundred seventy-one thousand, forty".