289421 has 8 divisors (see below), whose sum is σ = 320544. Its totient is φ = 259120.

The previous prime is 289417. The next prime is 289423. The reversal of 289421 is 124982.

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 289421 - 2² = 289417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 289421.

It is not an unprimeable number, because it can be changed into a prime (289423) 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, 755 + ... + 1071.

It is an arithmetic number, because the mean of its divisors is an integer number (40068).

2²⁸⁹⁴²¹ is an apocalyptic number.

It is an amenable number.

289421 is a deficient number, since it is larger than the sum of its proper divisors (31123).

289421 is a wasteful number, since it uses less digits than its factorization.

289421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411.

The product of its digits is 1152, while the sum is 26.

The square root of 289421 is about 537.9786241107. The cubic root of 289421 is about 66.1469788395.

It can be divided in two parts, 28 and 9421, that added together give a palindrome (9449).

The spelling of 289421 in words is "two hundred eighty-nine thousand, four hundred twenty-one".