289724 has 6 divisors (see below), whose sum is σ = 507024. Its totient is φ = 144860.

The previous prime is 289721. The next prime is 289727. The reversal of 289724 is 427982.

It is an interprime number because it is at equal distance from previous prime (289721) and next prime (289727).

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (289721) 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, 36212 + ... + 36219.

It is an arithmetic number, because the mean of its divisors is an integer number (84504).

2²⁸⁹⁷²⁴ is an apocalyptic number.

It is an amenable number.

289724 is a deficient number, since it is larger than the sum of its proper divisors (217300).

289724 is a wasteful number, since it uses less digits than its factorization.

289724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72435 (or 72433 counting only the distinct ones).

The product of its digits is 8064, while the sum is 32.

The square root of 289724 is about 538.2601601456. The cubic root of 289724 is about 66.1700542721.

It can be divided in two parts, 28 and 9724, that multiplied together give a palindrome (272272).

The spelling of 289724 in words is "two hundred eighty-nine thousand, seven hundred twenty-four".