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 an emirpimes, since its reverse is a distinct semiprime: 98754321 = 3 ⋅32918107.
It is a Duffinian number.
It is a plaindrome in base 10.
It is a congruent number.
Almost surely, 212345789 is an apocalyptic number.
It is an amenable number.
12345789 is an equidigital number, since it uses as much as digits as its factorization.
12345789 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 4115266.
The square root of 12345789 is about 3513.6574961143. The cubic root of 12345789 is about 231.1211111321.
The spelling of 12345789 in words is "twelve million, three hundred forty-five thousand, seven hundred eighty-nine".