871722 has 20 divisors (see below), whose sum is σ = 1953666. Its totient is φ = 290520.

The previous prime is 871687. The next prime is 871727. The reversal of 871722 is 227178.

871722 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 only one way, i.e., 793881 + 77841 = 891^2 + 279^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (871727) by changing a digit.

871722 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 9 ways as a sum of consecutive naturals, for example, 2529 + ... + 2852.

2⁸⁷¹⁷²² is an apocalyptic number.

871722 is an abundant number, since it is smaller than the sum of its proper divisors (1081944).

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

871722 is a wasteful number, since it uses less digits than its factorization.

871722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5395 (or 5386 counting only the distinct ones).

The product of its digits is 1568, while the sum is 27.

The square root of 871722 is about 933.6605378830. The cubic root of 871722 is about 95.5269698962.

The spelling of 871722 in words is "eight hundred seventy-one thousand, seven hundred twenty-two".