12378123 has 8 divisors (see below), whose sum is σ = 18338000. Its totient is φ = 8252064.

The previous prime is 12378103. The next prime is 12378127. The reversal of 12378123 is 32187321.

It is not a de Polignac number, because 12378123 - 2¹² = 12374027 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 458449 = 12378123 / (1 + 2 + 3 + 7 + 8 + 1 + 2 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12378127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 229198 + ... + 229251.

It is an arithmetic number, because the mean of its divisors is an integer number (2292250).

Almost surely, 2^12378123 is an apocalyptic number.

12378123 is a deficient number, since it is larger than the sum of its proper divisors (5959877).

12378123 is an equidigital number, since it uses as much as digits as its factorization.

12378123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458458 (or 458452 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 12378123 is about 3518.2556757575. The cubic root of 12378123 is about 231.3227063324.

The spelling of 12378123 in words is "twelve million, three hundred seventy-eight thousand, one hundred twenty-three".