871994 has 4 divisors (see below), whose sum is σ = 1307994. Its totient is φ = 435996.

The previous prime is 871993. The next prime is 872017. The reversal of 871994 is 499178.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 499178 = 2 ⋅249589.

It can be written as a sum of positive squares in only one way, i.e., 555025 + 316969 = 745^2 + 563^2 .

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (871993) 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 as a sum of consecutive naturals, namely, 217997 + ... + 218000.

2⁸⁷¹⁹⁹⁴ is an apocalyptic number.

871994 is a deficient number, since it is larger than the sum of its proper divisors (436000).

871994 is a wasteful number, since it uses less digits than its factorization.

871994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435999.

The product of its digits is 18144, while the sum is 38.

The square root of 871994 is about 933.8061897417. The cubic root of 871994 is about 95.5369044984.

Subtracting from 871994 its reverse (499178), we obtain a triangular number (372816 = T₈₆₃).

The spelling of 871994 in words is "eight hundred seventy-one thousand, nine hundred ninety-four".