13688440 has 16 divisors (see below), whose sum is σ = 30799080. Its totient is φ = 5475360.

The previous prime is 13688431. The next prime is 13688471. The reversal of 13688440 is 4488631.

It is a junction number, because it is equal to n+sod(n) for n = 13688396 and 13688405.

It is a congruent number.

It is an unprimeable number.

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, 171066 + ... + 171145.

Almost surely, 2^13688440 is an apocalyptic number.

13688440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13688440 is an abundant number, since it is smaller than the sum of its proper divisors (17110640).

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

13688440 is a wasteful number, since it uses less digits than its factorization.

13688440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342222 (or 342218 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 13688440 is about 3699.7891831833. The cubic root of 13688440 is about 239.2129309236.

The spelling of 13688440 in words is "thirteen million, six hundred eighty-eight thousand, four hundred forty".