289138005 has 40 divisors (see below), whose sum is σ = 558186552. Its totient is φ = 142342272.

The previous prime is 289137997. The next prime is 289138007. The reversal of 289138005 is 500831982.

It can be written as a sum of positive squares in 4 ways, for example, as 715716 + 288422289 = 846^2 + 16983^2 .

It is not a de Polignac number, because 289138005 - 2³ = 289137997 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (289138007) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 22194 + ... + 32723.

Almost surely, 2^289138005 is an apocalyptic number.

It is an amenable number.

289138005 is a deficient number, since it is larger than the sum of its proper divisors (269048547).

289138005 is a wasteful number, since it uses less digits than its factorization.

289138005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54947 (or 54938 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 289138005 is about 17004.0584861379. The cubic root of 289138005 is about 661.2541236850.

Adding to 289138005 its reverse (500831982), we get a palindrome (789969987).

The spelling of 289138005 in words is "two hundred eighty-nine million, one hundred thirty-eight thousand, five".