871218 has 24 divisors (see below), whose sum is σ = 1953900. Its totient is φ = 280224.

The previous prime is 871181. The next prime is 871229. The reversal of 871218 is 812178.

871218 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 870489 + 729 = 933^2 + 27^2 .

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 871191 and 871200.

It is an unprimeable number.

871218 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 11 ways as a sum of consecutive naturals, for example, 313 + ... + 1356.

2⁸⁷¹²¹⁸ is an apocalyptic number.

871218 is an abundant number, since it is smaller than the sum of its proper divisors (1082682).

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

871218 is a wasteful number, since it uses less digits than its factorization.

871218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1706 (or 1703 counting only the distinct ones).

The product of its digits is 896, while the sum is 27.

The square root of 871218 is about 933.3905934816. The cubic root of 871218 is about 95.5085561991.

It can be divided in two parts, 8712 and 18, that multiplied together give a square (156816 = 396²).

The spelling of 871218 in words is "eight hundred seventy-one thousand, two hundred eighteen".