871440 has 40 divisors (see below), whose sum is σ = 2702208. Its totient is φ = 232320.

The previous prime is 871439. The next prime is 871459. The reversal of 871440 is 44178.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 871440.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 871440.

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 7 ways as a sum of consecutive naturals, for example, 1576 + ... + 2055.

2⁸⁷¹⁴⁴⁰ is an apocalyptic number.

871440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

871440 is an abundant number, since it is smaller than the sum of its proper divisors (1830768).

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

871440 is a wasteful number, since it uses less digits than its factorization.

871440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3647 (or 3641 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 871440 is about 933.5095071824. The cubic root of 871440 is about 95.5166678691.

The spelling of 871440 in words is "eight hundred seventy-one thousand, four hundred forty".