12356789 has 2 divisors, whose sum is σ = 12356790.
Its totient is φ = 12356788.
The previous prime is 12356777. The next prime is 12356801. The reversal of 12356789 is 98765321.
It is a balanced prime because it is at equal distance from previous prime (12356777) and next prime (12356801).
It can be written as a sum of positive squares in only one way, i.e., 11336689 + 1020100 = 3367^2 + 1010^2
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-12356789 is a prime.
It is a plaindrome in base 10.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (12356749) 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 as a sum of consecutive naturals, namely, 6178394 + 6178395.
It is an arithmetic number, because the mean of its divisors is an integer number (6178395).
Almost surely, 212356789 is an apocalyptic number.
It is an amenable number.
12356789 is a deficient number, since it is larger than the sum of its proper divisors (1).
12356789 is an equidigital number, since it uses as much as digits as its factorization.
12356789 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 90720, while the sum is 41.
The square root of 12356789 is about 3515.2224680666.
Note that the first 3 decimals coincide.
The cubic root of 12356789 is about 231.1897331141.
The spelling of 12356789 in words is "twelve million, three hundred fifty-six thousand, seven hundred eighty-nine".