12784123 has 4 divisors (see below), whose sum is σ = 13946328. Its totient is φ = 11621920.

The previous prime is 12784117. The next prime is 12784133. The reversal of 12784123 is 32148721.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12784123 - 2⁵ = 12784091 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12784091 and 12784100.

It is not an unprimeable number, because it can be changed into a prime (12784133) 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, 581086 + ... + 581107.

It is an arithmetic number, because the mean of its divisors is an integer number (3486582).

Almost surely, 2^12784123 is an apocalyptic number.

12784123 is a deficient number, since it is larger than the sum of its proper divisors (1162205).

12784123 is a wasteful number, since it uses less digits than its factorization.

12784123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1162204.

The product of its digits is 2688, while the sum is 28.

The square root of 12784123 is about 3575.4891972987. The cubic root of 12784123 is about 233.8246610617.

The spelling of 12784123 in words is "twelve million, seven hundred eighty-four thousand, one hundred twenty-three".