12195839 has 4 divisors (see below), whose sum is σ = 12244680. Its totient is φ = 12147000.

The previous prime is 12195811. The next prime is 12195847. The reversal of 12195839 is 93859121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93859121 = 37 ⋅2536733.

It is a cyclic number.

It is not a de Polignac number, because 12195839 - 2²⁰ = 11147263 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 (12194839) 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, 24044 + ... + 24545.

It is an arithmetic number, because the mean of its divisors is an integer number (3061170).

Almost surely, 2^12195839 is an apocalyptic number.

12195839 is a deficient number, since it is larger than the sum of its proper divisors (48841).

12195839 is an equidigital number, since it uses as much as digits as its factorization.

12195839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48840.

The product of its digits is 19440, while the sum is 38.

The square root of 12195839 is about 3492.2541431001. The cubic root of 12195839 is about 230.1815768406.

The spelling of 12195839 in words is "twelve million, one hundred ninety-five thousand, eight hundred thirty-nine".