869289 has 4 divisors (see below), whose sum is σ = 1159056. Its totient is φ = 579524.

The previous prime is 869273. The next prime is 869291. The reversal of 869289 is 982968.

869289 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 a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 869289 - 2⁴ = 869273 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 869289.

It is not an unprimeable number, because it can be changed into a prime (869249) 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, 144879 + ... + 144884.

It is an arithmetic number, because the mean of its divisors is an integer number (289764).

2⁸⁶⁹²⁸⁹ is an apocalyptic number.

It is an amenable number.

869289 is a deficient number, since it is larger than the sum of its proper divisors (289767).

869289 is a wasteful number, since it uses less digits than its factorization.

869289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289766.

The product of its digits is 62208, while the sum is 42.

The square root of 869289 is about 932.3566914009. The cubic root of 869289 is about 95.4380142883.

The spelling of 869289 in words is "eight hundred sixty-nine thousand, two hundred eighty-nine".