872665 has 4 divisors (see below), whose sum is σ = 1047204. Its totient is φ = 698128.

The previous prime is 872659. The next prime is 872671. The reversal of 872665 is 566278.

872665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 566278 = 2 ⋅283139.

It is an interprime number because it is at equal distance from previous prime (872659) and next prime (872671).

It can be written as a sum of positive squares in 2 ways, for example, as 447561 + 425104 = 669^2 + 652^2 .

It is a cyclic number.

It is not a de Polignac number, because 872665 - 2³ = 872657 is a prime.

It is a Duffinian number.

872665 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 872665.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87262 + ... + 87271.

It is an arithmetic number, because the mean of its divisors is an integer number (261801).

2⁸⁷²⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

872665 is a deficient number, since it is larger than the sum of its proper divisors (174539).

872665 is a wasteful number, since it uses less digits than its factorization.

872665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174538.

The product of its digits is 20160, while the sum is 34.

The square root of 872665 is about 934.1654029132. The cubic root of 872665 is about 95.5614034540.

The spelling of 872665 in words is "eight hundred seventy-two thousand, six hundred sixty-five".