12478789 has 4 divisors (see below), whose sum is σ = 12488256. Its totient is φ = 12469324.

The previous prime is 12478783. The next prime is 12478793. The reversal of 12478789 is 98787421.

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: 98787421 = 31 ⋅3186691.

It is a cyclic number.

It is not a de Polignac number, because 12478789 - 2⁵ = 12478757 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 (12478783) 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 3 ways as a sum of consecutive naturals, for example, 2359 + ... + 5524.

It is an arithmetic number, because the mean of its divisors is an integer number (3122064).

Almost surely, 2^12478789 is an apocalyptic number.

It is an amenable number.

12478789 is a deficient number, since it is larger than the sum of its proper divisors (9467).

12478789 is an equidigital number, since it uses as much as digits as its factorization.

12478789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9466.

The product of its digits is 225792, while the sum is 46.

The square root of 12478789 is about 3532.5329439370. The cubic root of 12478789 is about 231.9480970396.

The spelling of 12478789 in words is "twelve million, four hundred seventy-eight thousand, seven hundred eighty-nine".