12688938 has 24 divisors (see below), whose sum is σ = 27584388. Its totient is φ = 4215552.

The previous prime is 12688937. The next prime is 12688943. The reversal of 12688938 is 83988621.

It can be written as a sum of positive squares in 2 ways, for example, as 11108889 + 1580049 = 3333^2 + 1257^2 .

It is a super-2 number, since 2×12688938² = 322018295135688, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 12688893 and 12688902.

It is not an unprimeable number, because it can be changed into a prime (12688931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5356 + ... + 7352.

Almost surely, 2^12688938 is an apocalyptic number.

12688938 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12688938 is an abundant number, since it is smaller than the sum of its proper divisors (14895450).

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

12688938 is a wasteful number, since it uses less digits than its factorization.

12688938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2358 (or 2355 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 12688938 is about 3562.1535621026. The cubic root of 12688938 is about 233.2428960178.

The spelling of 12688938 in words is "twelve million, six hundred eighty-eight thousand, nine hundred thirty-eight".