12219139 has 4 divisors (see below), whose sum is σ = 12549424. Its totient is φ = 11888856.

The previous prime is 12219133. The next prime is 12219157. The reversal of 12219139 is 93191221.

12219139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 12219139 - 2⁹ = 12218627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12219133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165087 + ... + 165160.

It is an arithmetic number, because the mean of its divisors is an integer number (3137356).

Almost surely, 2^12219139 is an apocalyptic number.

12219139 is a deficient number, since it is larger than the sum of its proper divisors (330285).

12219139 is an equidigital number, since it uses as much as digits as its factorization.

12219139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330284.

The product of its digits is 972, while the sum is 28.

The square root of 12219139 is about 3495.5885055309. The cubic root of 12219139 is about 230.3280699437.

The spelling of 12219139 in words is "twelve million, two hundred nineteen thousand, one hundred thirty-nine".