871939 has 4 divisors (see below), whose sum is σ = 874440. Its totient is φ = 869440.

The previous prime is 871931. The next prime is 871957. The reversal of 871939 is 939178.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 939178 = 2 ⋅469589.

It is a cyclic number.

It is not a de Polignac number, because 871939 - 2³ = 871931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 871898 and 871907.

It is not an unprimeable number, because it can be changed into a prime (871931) 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, 622 + ... + 1459.

It is an arithmetic number, because the mean of its divisors is an integer number (218610).

2⁸⁷¹⁹³⁹ is an apocalyptic number.

871939 is a deficient number, since it is larger than the sum of its proper divisors (2501).

871939 is a wasteful number, since it uses less digits than its factorization.

871939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2500.

The product of its digits is 13608, while the sum is 37.

The square root of 871939 is about 933.7767399116. The cubic root of 871939 is about 95.5348958300.

The spelling of 871939 in words is "eight hundred seventy-one thousand, nine hundred thirty-nine".