871866 has 12 divisors (see below), whose sum is σ = 1889082. Its totient is φ = 290616.

The previous prime is 871837. The next prime is 871867. The reversal of 871866 is 668178.

It can be written as a sum of positive squares in only one way, i.e., 772641 + 99225 = 879^2 + 315^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 871866.

It is not an unprimeable number, because it can be changed into a prime (871867) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24201 + ... + 24236.

2⁸⁷¹⁸⁶⁶ is an apocalyptic number.

871866 is an abundant number, since it is smaller than the sum of its proper divisors (1017216).

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

871866 is a wasteful number, since it uses less digits than its factorization.

871866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48445 (or 48442 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 871866 is about 933.7376505207. The cubic root of 871866 is about 95.5322296488.

It can be divided in two parts, 87 and 1866, that added together give a triangular number (1953 = T₆₂).

The spelling of 871866 in words is "eight hundred seventy-one thousand, eight hundred sixty-six".