12138289 has 12 divisors (see below), whose sum is σ = 13057324. Its totient is φ = 11280384.

The previous prime is 12138277. The next prime is 12138293. The reversal of 12138289 is 98283121.

It can be written as a sum of positive squares in 6 ways, for example, as 27889 + 12110400 = 167^2 + 3480^2 .

It is not a de Polignac number, because 12138289 - 2¹⁷ = 12007217 is a prime.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12138209) by changing a digit.

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 in 11 ways as a sum of consecutive naturals, for example, 27817 + ... + 28249.

Almost surely, 2^12138289 is an apocalyptic number.

It is an amenable number.

12138289 is a deficient number, since it is larger than the sum of its proper divisors (919035).

12138289 is an equidigital number, since it uses as much as digits as its factorization.

12138289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564 (or 547 counting only the distinct ones).

The product of its digits is 6912, while the sum is 34.

The square root of 12138289 is about 3484.0047359325. The cubic root of 12138289 is about 229.8189438363.

The spelling of 12138289 in words is "twelve million, one hundred thirty-eight thousand, two hundred eighty-nine".