289123 has 4 divisors (see below), whose sum is σ = 304360. Its totient is φ = 273888.

The previous prime is 289111. The next prime is 289127. The reversal of 289123 is 321982.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-289123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (289127) 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, 7590 + ... + 7627.

It is an arithmetic number, because the mean of its divisors is an integer number (76090).

2²⁸⁹¹²³ is an apocalyptic number.

289123 is a deficient number, since it is larger than the sum of its proper divisors (15237).

289123 is a wasteful number, since it uses less digits than its factorization.

289123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15236.

The product of its digits is 864, while the sum is 25.

The square root of 289123 is about 537.7015901037. The cubic root of 289123 is about 66.1242684753.

It can be divided in two parts, 28912 and 3, that multiplied together give a triangular number (86736 = T₄₁₆).

The spelling of 289123 in words is "two hundred eighty-nine thousand, one hundred twenty-three".