12129816 has 16 divisors (see below), whose sum is σ = 30324600. Its totient is φ = 4043264.

The previous prime is 12129811. The next prime is 12129829. The reversal of 12129816 is 61892121.

It is a happy number.

It is an alternating number because its digits alternate between odd and even.

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 3 ways as a sum of consecutive naturals, for example, 252681 + ... + 252728.

Almost surely, 2^12129816 is an apocalyptic number.

It is an amenable number.

12129816 is an abundant number, since it is smaller than the sum of its proper divisors (18194784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12129816 is a wasteful number, since it uses less digits than its factorization.

12129816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505418 (or 505414 counting only the distinct ones).

The product of its digits is 1728, while the sum is 30.

The square root of 12129816 is about 3482.7885379391. The cubic root of 12129816 is about 229.7654571882.

The spelling of 12129816 in words is "twelve million, one hundred twenty-nine thousand, eight hundred sixteen".