12329991 has 24 divisors (see below), whose sum is σ = 18621824. Its totient is φ = 7853760.

The previous prime is 12329963. The next prime is 12330011. The reversal of 12329991 is 19992321.

It is a happy number.

12329991 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 12329991 - 2¹⁷ = 12198919 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12329591) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20010 + ... + 20616.

Almost surely, 2^12329991 is an apocalyptic number.

12329991 is a deficient number, since it is larger than the sum of its proper divisors (6291833).

12329991 is a wasteful number, since it uses less digits than its factorization.

12329991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711 (or 708 counting only the distinct ones).

The product of its digits is 8748, while the sum is 36.

The square root of 12329991 is about 3511.4086916792. The cubic root of 12329991 is about 231.0224861452.

The spelling of 12329991 in words is "twelve million, three hundred twenty-nine thousand, nine hundred ninety-one".