289999 has 2 divisors, whose sum is σ = 290000. Its totient is φ = 289998.

The previous prime is 289987. The next prime is 290011. The reversal of 289999 is 999982.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (289987) and next prime (290011).

It is a cyclic number.

It is not a de Polignac number, because 289999 - 2⁵ = 289967 is a prime.

It is a Chen prime.

It is an Ulam number.

289999 is a modest number, since divided by 999 gives 289 as remainder.

289999 is a lucky number.

It is a plaindrome in base 10 and base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (289099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144999 + 145000.

It is an arithmetic number, because the mean of its divisors is an integer number (145000).

2²⁸⁹⁹⁹⁹ is an apocalyptic number.

289999 is a deficient number, since it is larger than the sum of its proper divisors (1).

289999 is an equidigital number, since it uses as much as digits as its factorization.

289999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 104976, while the sum is 46.

The square root of 289999 is about 538.5155522360. The cubic root of 289999 is about 66.1909833985.

It can be divided in two parts, 28 and 9999, that multiplied together give a palindrome (279972).

The spelling of 289999 in words is "two hundred eighty-nine thousand, nine hundred ninety-nine".