13791387 has 8 divisors (see below), whose sum is σ = 18495504. Its totient is φ = 9140768.

The previous prime is 13791377. The next prime is 13791389. The reversal of 13791387 is 78319731.

It is a happy number.

13791387 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 sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13791387 - 2²⁰ = 12742811 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13791389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12768 + ... + 13805.

It is an arithmetic number, because the mean of its divisors is an integer number (2311938).

Almost surely, 2^13791387 is an apocalyptic number.

13791387 is a deficient number, since it is larger than the sum of its proper divisors (4704117).

13791387 is a wasteful number, since it uses less digits than its factorization.

13791387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26749.

The product of its digits is 31752, while the sum is 39.

The square root of 13791387 is about 3713.6756724302. The cubic root of 13791387 is about 239.8111187496.

The spelling of 13791387 in words is "thirteen million, seven hundred ninety-one thousand, three hundred eighty-seven".