13809687 has 4 divisors (see below), whose sum is σ = 18412920. Its totient is φ = 9206456.

The previous prime is 13809673. The next prime is 13809707. The reversal of 13809687 is 78690831.

13809687 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 a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13809687 - 2⁸ = 13809431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13809647) 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, 2301612 + ... + 2301617.

It is an arithmetic number, because the mean of its divisors is an integer number (4603230).

Almost surely, 2^13809687 is an apocalyptic number.

13809687 is a deficient number, since it is larger than the sum of its proper divisors (4603233).

13809687 is an equidigital number, since it uses as much as digits as its factorization.

13809687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4603232.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 13809687 is about 3716.1387218456. The cubic root of 13809687 is about 239.9171415358.

The spelling of 13809687 in words is "thirteen million, eight hundred nine thousand, six hundred eighty-seven".