289989657 has 6 divisors (see below), whose sum is σ = 418873962. Its totient is φ = 193326432.

The previous prime is 289989649. The next prime is 289989673. The reversal of 289989657 is 756989982.

It can be written as a sum of positive squares in only one way, i.e., 273538521 + 16451136 = 16539^2 + 4056^2 .

It is not a de Polignac number, because 289989657 - 2³ = 289989649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 289989594 and 289989603.

It is not an unprimeable number, because it can be changed into a prime (289989607) 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 5 ways as a sum of consecutive naturals, for example, 16110528 + ... + 16110545.

It is an arithmetic number, because the mean of its divisors is an integer number (69812327).

Almost surely, 2^289989657 is an apocalyptic number.

It is an amenable number.

289989657 is a deficient number, since it is larger than the sum of its proper divisors (128884305).

289989657 is a wasteful number, since it uses less digits than its factorization.

289989657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32221079 (or 32221076 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 63.

The square root of 289989657 is about 17029.0826822821. The cubic root of 289989657 is about 661.9027255812.

The spelling of 289989657 in words is "two hundred eighty-nine million, nine hundred eighty-nine thousand, six hundred fifty-seven".