12129819 has 8 divisors (see below), whose sum is σ = 17417232. Its totient is φ = 7464480.

The previous prime is 12129811. The next prime is 12129829. The reversal of 12129819 is 91892121.

12129819 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12129819 - 2³ = 12129811 is a prime.

It is a super-2 number, since 2×12129819² = 294265017945522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12129819.

It is not an unprimeable number, because it can be changed into a prime (12129811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155472 + ... + 155549.

It is an arithmetic number, because the mean of its divisors is an integer number (2177154).

Almost surely, 2^12129819 is an apocalyptic number.

12129819 is a deficient number, since it is larger than the sum of its proper divisors (5287413).

12129819 is a wasteful number, since it uses less digits than its factorization.

12129819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311037.

The product of its digits is 2592, while the sum is 33.

The square root of 12129819 is about 3482.7889686284. The cubic root of 12129819 is about 229.7654761304.

The spelling of 12129819 in words is "twelve million, one hundred twenty-nine thousand, eight hundred nineteen".