872109 has 24 divisors (see below), whose sum is σ = 1464320. Its totient is φ = 489888.

The previous prime is 872107. The next prime is 872129. The reversal of 872109 is 901278.

It is not a de Polignac number, because 872109 - 2¹ = 872107 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (872107) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6804 + ... + 6930.

2⁸⁷²¹⁰⁹ is an apocalyptic number.

It is an amenable number.

872109 is a deficient number, since it is larger than the sum of its proper divisors (592211).

872109 is a wasteful number, since it uses less digits than its factorization.

872109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249 (or 246 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 872109 is about 933.8677636582. The cubic root of 872109 is about 95.5411041683.

The spelling of 872109 in words is "eight hundred seventy-two thousand, one hundred nine".