289639 has 12 divisors (see below), whose sum is σ = 352944. Its totient is φ = 236544.

The previous prime is 289637. The next prime is 289643. The reversal of 289639 is 936982.

It is not a de Polignac number, because 289639 - 2¹ = 289637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 289598 and 289607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (289637) 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 in 11 ways as a sum of consecutive naturals, for example, 999 + ... + 1255.

It is an arithmetic number, because the mean of its divisors is an integer number (29412).

2²⁸⁹⁶³⁹ is an apocalyptic number.

289639 is a deficient number, since it is larger than the sum of its proper divisors (63305).

289639 is a wasteful number, since it uses less digits than its factorization.

289639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294 (or 287 counting only the distinct ones).

The product of its digits is 23328, while the sum is 37.

The square root of 289639 is about 538.1811962527. The cubic root of 289639 is about 66.1635825902.

The spelling of 289639 in words is "two hundred eighty-nine thousand, six hundred thirty-nine".