12688749 has 24 divisors (see below), whose sum is σ = 19543680. Its totient is φ = 7905408.

The previous prime is 12688733. The next prime is 12688757. The reversal of 12688749 is 94788621.

It is not a de Polignac number, because 12688749 - 2⁴ = 12688733 is a prime.

It is a super-2 number, since 2×12688749² = 322008702370002, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12688729) 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 23 ways as a sum of consecutive naturals, for example, 36394 + ... + 36740.

It is an arithmetic number, because the mean of its divisors is an integer number (814320).

Almost surely, 2^12688749 is an apocalyptic number.

It is an amenable number.

12688749 is a deficient number, since it is larger than the sum of its proper divisors (6854931).

12688749 is a wasteful number, since it uses less digits than its factorization.

12688749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609 (or 606 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 12688749 is about 3562.1270331082. The cubic root of 12688749 is about 233.2417379717.

The spelling of 12688749 in words is "twelve million, six hundred eighty-eight thousand, seven hundred forty-nine".