12138989 has 4 divisors (see below), whose sum is σ = 12149760. Its totient is φ = 12128220.

The previous prime is 12138983. The next prime is 12139007. The reversal of 12138989 is 98983121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 98983121 = 359 ⋅275719.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12138989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12138983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3467 + ... + 6024.

It is an arithmetic number, because the mean of its divisors is an integer number (3037440).

Almost surely, 2^12138989 is an apocalyptic number.

It is an amenable number.

12138989 is a deficient number, since it is larger than the sum of its proper divisors (10771).

12138989 is an equidigital number, since it uses as much as digits as its factorization.

12138989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10770.

The product of its digits is 31104, while the sum is 41.

The square root of 12138989 is about 3484.1051935899. The cubic root of 12138989 is about 229.8233615420.

The spelling of 12138989 in words is "twelve million, one hundred thirty-eight thousand, nine hundred eighty-nine".