12988109 has 4 divisors (see below), whose sum is σ = 13027680. Its totient is φ = 12948540.

The previous prime is 12988099. The next prime is 12988159. The reversal of 12988109 is 90188921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12988109 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12988159) 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 3 ways as a sum of consecutive naturals, for example, 19289 + ... + 19950.

It is an arithmetic number, because the mean of its divisors is an integer number (3256920).

Almost surely, 2^12988109 is an apocalyptic number.

It is an amenable number.

12988109 is a deficient number, since it is larger than the sum of its proper divisors (39571).

12988109 is an equidigital number, since it uses as much as digits as its factorization.

12988109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39570.

The product of its (nonzero) digits is 10368, while the sum is 38.

The square root of 12988109 is about 3603.9019132046. The cubic root of 12988109 is about 235.0617553107.

The spelling of 12988109 in words is "twelve million, nine hundred eighty-eight thousand, one hundred nine".