289861 has 8 divisors (see below), whose sum is σ = 340704. Its totient is φ = 243120.

The previous prime is 289859. The next prime is 289871. The reversal of 289861 is 168982.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 289861 - 2¹ = 289859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (289841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 871 + ... + 1156.

It is an arithmetic number, because the mean of its divisors is an integer number (42588).

2²⁸⁹⁸⁶¹ is an apocalyptic number.

It is an amenable number.

289861 is a deficient number, since it is larger than the sum of its proper divisors (50843).

289861 is a wasteful number, since it uses less digits than its factorization.

289861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2051.

The product of its digits is 6912, while the sum is 34.

The square root of 289861 is about 538.3874069850. The cubic root of 289861 is about 66.1804824370.

It can be divided in two parts, 28 and 9861, that added together give a palindrome (9889).

The spelling of 289861 in words is "two hundred eighty-nine thousand, eight hundred sixty-one".