12388509 has 12 divisors (see below), whose sum is σ = 20450976. Its totient is φ = 7079112.

The previous prime is 12388507. The next prime is 12388511. The reversal of 12388509 is 90588321.

12388509 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12388507) and next prime (12388511).

It is not a de Polignac number, because 12388509 - 2¹ = 12388507 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12388507) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 98259 + ... + 98384.

It is an arithmetic number, because the mean of its divisors is an integer number (1704248).

Almost surely, 2^12388509 is an apocalyptic number.

It is an amenable number.

12388509 is a deficient number, since it is larger than the sum of its proper divisors (8062467).

12388509 is a wasteful number, since it uses less digits than its factorization.

12388509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196656 (or 196653 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 12388509 is about 3519.7313817961. The cubic root of 12388509 is about 231.3873861978.

It can be divided in two parts, 12 and 388509, that added together give a triangular number (388521 = T₈₈₁).

The spelling of 12388509 in words is "twelve million, three hundred eighty-eight thousand, five hundred nine".