13688387 has 4 divisors (see below), whose sum is σ = 13701840. Its totient is φ = 13674936.

The previous prime is 13688371. The next prime is 13688393. The reversal of 13688387 is 78388631.

13688387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13688387 - 2⁴ = 13688371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13688317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5063 + ... + 7280.

It is an arithmetic number, because the mean of its divisors is an integer number (3425460).

Almost surely, 2^13688387 is an apocalyptic number.

13688387 is a deficient number, since it is larger than the sum of its proper divisors (13453).

13688387 is a wasteful number, since it uses less digits than its factorization.

13688387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13452.

The product of its digits is 193536, while the sum is 44.

The square root of 13688387 is about 3699.7820206061. The cubic root of 13688387 is about 239.2126221886.

The spelling of 13688387 in words is "thirteen million, six hundred eighty-eight thousand, three hundred eighty-seven".