12129823 has 8 divisors (see below), whose sum is σ = 12896928. Its totient is φ = 11368704.

The previous prime is 12129811. The next prime is 12129829. The reversal of 12129823 is 32892121.

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

It is a cyclic number.

It is not a de Polignac number, because 12129823 - 2¹³ = 12121631 is a prime.

It is a super-2 number, since 2×12129823² = 294265212022658, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12129791 and 12129800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12129829) 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 7 ways as a sum of consecutive naturals, for example, 3115 + ... + 5827.

It is an arithmetic number, because the mean of its divisors is an integer number (1612116).

Almost surely, 2^12129823 is an apocalyptic number.

12129823 is a deficient number, since it is larger than the sum of its proper divisors (767105).

12129823 is a wasteful number, since it uses less digits than its factorization.

12129823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2993.

The product of its digits is 1728, while the sum is 28.

The square root of 12129823 is about 3482.7895428808. The cubic root of 12129823 is about 229.7655013867.

The spelling of 12129823 in words is "twelve million, one hundred twenty-nine thousand, eight hundred twenty-three".