12129815 has 8 divisors (see below), whose sum is σ = 14583888. Its totient is φ = 9685120.

The previous prime is 12129811. The next prime is 12129829. The reversal of 12129815 is 51892121.

12129815 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 12129815 - 2² = 12129811 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 (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, 920 + ... + 5010.

It is an arithmetic number, because the mean of its divisors is an integer number (1822986).

Almost surely, 2^12129815 is an apocalyptic number.

12129815 is a deficient number, since it is larger than the sum of its proper divisors (2454073).

12129815 is an equidigital number, since it uses as much as digits as its factorization.

12129815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4689.

The product of its digits is 1440, while the sum is 29.

The square root of 12129815 is about 3482.7883943760. The cubic root of 12129815 is about 229.7654508742.

The spelling of 12129815 in words is "twelve million, one hundred twenty-nine thousand, eight hundred fifteen".