289309138 has 4 divisors (see below), whose sum is σ = 433963710. Its totient is φ = 144654568.

The previous prime is 289309129. The next prime is 289309169. The reversal of 289309138 is 831903982.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 198049329 + 91259809 = 14073^2 + 9553^2 .

It is a junction number, because it is equal to n+sod(n) for n = 289309094 and 289309103.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72327283 + ... + 72327286.

Almost surely, 2^289309138 is an apocalyptic number.

289309138 is a deficient number, since it is larger than the sum of its proper divisors (144654572).

289309138 is a wasteful number, since it uses less digits than its factorization.

289309138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144654571.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 289309138 is about 17009.0898639522. The cubic root of 289309138 is about 661.3845574587.

The spelling of 289309138 in words is "two hundred eighty-nine million, three hundred nine thousand, one hundred thirty-eight".