12129999 has 48 divisors (see below), whose sum is σ = 20465280. Its totient is φ = 6350400.

The previous prime is 12129991. The next prime is 12130003. The reversal of 12129999 is 99992121.

12129999 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12129999 - 2³ = 12129991 is a prime.

12129999 is a modest number, since divided by 9999 gives 1212 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 12129999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12129991) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 120049 + ... + 120149.

It is an arithmetic number, because the mean of its divisors is an integer number (426360).

Almost surely, 2^12129999 is an apocalyptic number.

12129999 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

12129999 is the 1862-nd nonagonal number.

12129999 is a deficient number, since it is larger than the sum of its proper divisors (8335281).

12129999 is a wasteful number, since it uses less digits than its factorization.

12129999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180 (or 173 counting only the distinct ones).

The product of its digits is 26244, while the sum is 42.

The square root of 12129999 is about 3482.8148098916. The cubic root of 12129999 is about 229.7666126569.

It can be divided in two parts, 1212 and 9999, that added together give a palindrome (11211).

The spelling of 12129999 in words is "twelve million, one hundred twenty-nine thousand, nine hundred ninety-nine".