871405 has 4 divisors (see below), whose sum is σ = 1045692. Its totient is φ = 697120.

The previous prime is 871393. The next prime is 871439. The reversal of 871405 is 504178.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 635209 + 236196 = 797^2 + 486^2 .

It is a de Polignac number, because none of the positive numbers 2^k-871405 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 871405.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87136 + ... + 87145.

It is an arithmetic number, because the mean of its divisors is an integer number (261423).

2⁸⁷¹⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

871405 is a deficient number, since it is larger than the sum of its proper divisors (174287).

871405 is a wasteful number, since it uses less digits than its factorization.

871405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174286.

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

The square root of 871405 is about 933.4907605327. The cubic root of 871405 is about 95.5153890937.

The spelling of 871405 in words is "eight hundred seventy-one thousand, four hundred five".