871257 has 4 divisors (see below), whose sum is σ = 1161680. Its totient is φ = 580836.

The previous prime is 871249. The next prime is 871259. The reversal of 871257 is 752178.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 871257 - 2³ = 871249 is a prime.

It is a D-number.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 871257.

It is not an unprimeable number, because it can be changed into a prime (871259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145207 + ... + 145212.

It is an arithmetic number, because the mean of its divisors is an integer number (290420).

2⁸⁷¹²⁵⁷ is an apocalyptic number.

It is an amenable number.

871257 is a deficient number, since it is larger than the sum of its proper divisors (290423).

871257 is a wasteful number, since it uses less digits than its factorization.

871257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290422.

The product of its digits is 3920, while the sum is 30.

The square root of 871257 is about 933.4114848233. The cubic root of 871257 is about 95.5099813220.

It can be divided in two parts, 871 and 257, that added together give a triangular number (1128 = T₄₇).

The spelling of 871257 in words is "eight hundred seventy-one thousand, two hundred fifty-seven".