871679 has 2 divisors, whose sum is σ = 871680. Its totient is φ = 871678.

The previous prime is 871657. The next prime is 871681. The reversal of 871679 is 976178.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-871679 is a prime.

It is a Sophie Germain prime.

Together with 871681, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (871639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435839 + 435840.

It is an arithmetic number, because the mean of its divisors is an integer number (435840).

2⁸⁷¹⁶⁷⁹ is an apocalyptic number.

871679 is a deficient number, since it is larger than the sum of its proper divisors (1).

871679 is an equidigital number, since it uses as much as digits as its factorization.

871679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 38.

The square root of 871679 is about 933.6375099577. The cubic root of 871679 is about 95.5253991633.

The spelling of 871679 in words is "eight hundred seventy-one thousand, six hundred seventy-nine".