289681 has 8 divisors (see below), whose sum is σ = 342720. Its totient is φ = 239568.

The previous prime is 289669. The next prime is 289717. The reversal of 289681 is 186982.

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

It is not a de Polignac number, because 289681 - 2⁹ = 289169 is a prime.

It is a super-4 number, since 4×289681⁴ (a number of 23 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (289181) 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, 511 + ... + 916.

It is an arithmetic number, because the mean of its divisors is an integer number (42840).

2²⁸⁹⁶⁸¹ is an apocalyptic number.

It is an amenable number.

289681 is a deficient number, since it is larger than the sum of its proper divisors (53039).

289681 is a wasteful number, since it uses less digits than its factorization.

289681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1463.

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

The square root of 289681 is about 538.2202151536. The cubic root of 289681 is about 66.1667805207.

The spelling of 289681 in words is "two hundred eighty-nine thousand, six hundred eighty-one".