12219839 has 4 divisors (see below), whose sum is σ = 12450456. Its totient is φ = 11989224.

The previous prime is 12219829. The next prime is 12219871. The reversal of 12219839 is 93891221.

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 12219839 - 2¹² = 12215743 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12219799 and 12219808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12219829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115229 + ... + 115334.

It is an arithmetic number, because the mean of its divisors is an integer number (3112614).

Almost surely, 2^12219839 is an apocalyptic number.

12219839 is a deficient number, since it is larger than the sum of its proper divisors (230617).

12219839 is an equidigital number, since it uses as much as digits as its factorization.

12219839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230616.

The product of its digits is 7776, while the sum is 35.

The square root of 12219839 is about 3495.6886302988. The cubic root of 12219839 is about 230.3324681415.

The spelling of 12219839 in words is "twelve million, two hundred nineteen thousand, eight hundred thirty-nine".