871642 has 8 divisors (see below), whose sum is σ = 1321236. Its totient is φ = 431232.

The previous prime is 871639. The next prime is 871643. The reversal of 871642 is 246178.

It can be written as a sum of positive squares in 2 ways, for example, as 776161 + 95481 = 881^2 + 309^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 871642.

It is not an unprimeable number, because it can be changed into a prime (871643) 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 in 3 ways as a sum of consecutive naturals, for example, 2053 + ... + 2440.

2⁸⁷¹⁶⁴² is an apocalyptic number.

871642 is a deficient number, since it is larger than the sum of its proper divisors (449594).

871642 is a wasteful number, since it uses less digits than its factorization.

871642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4592.

The product of its digits is 2688, while the sum is 28.

The square root of 871642 is about 933.6176947766. The cubic root of 871642 is about 95.5240475611.

The spelling of 871642 in words is "eight hundred seventy-one thousand, six hundred forty-two".