13791647 has 4 divisors (see below), whose sum is σ = 13814976. Its totient is φ = 13768320.

The previous prime is 13791643. The next prime is 13791649. The reversal of 13791647 is 74619731.

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 13791647 - 2² = 13791643 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13791647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13791643) 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, 10754 + ... + 11967.

It is an arithmetic number, because the mean of its divisors is an integer number (3453744).

Almost surely, 2^13791647 is an apocalyptic number.

13791647 is a deficient number, since it is larger than the sum of its proper divisors (23329).

13791647 is an equidigital number, since it uses as much as digits as its factorization.

13791647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23328.

The product of its digits is 31752, while the sum is 38.

The square root of 13791647 is about 3713.7106780146. The cubic root of 13791647 is about 239.8126257408.

The spelling of 13791647 in words is "thirteen million, seven hundred ninety-one thousand, six hundred forty-seven".