871978 has 8 divisors (see below), whose sum is σ = 1316772. Its totient is φ = 433056.

The previous prime is 871973. The next prime is 871987. The reversal of 871978 is 879178.

871978 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 797449 + 74529 = 893^2 + 273^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 871978.

It is not an unprimeable number, because it can be changed into a prime (871973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1075 + ... + 1702.

2⁸⁷¹⁹⁷⁸ is an apocalyptic number.

871978 is a deficient number, since it is larger than the sum of its proper divisors (444794).

871978 is a wasteful number, since it uses less digits than its factorization.

871978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2936.

The product of its digits is 28224, while the sum is 40.

The square root of 871978 is about 933.7976226142. The cubic root of 871978 is about 95.5363201672.

It can be divided in two parts, 871 and 978, that added together give a square (1849 = 43²).

The spelling of 871978 in words is "eight hundred seventy-one thousand, nine hundred seventy-eight".