13680447 has 8 divisors (see below), whose sum is σ = 19898880. Its totient is φ = 8291160.

The previous prime is 13680439. The next prime is 13680479. The reversal of 13680447 is 74408631.

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

It is not a de Polignac number, because 13680447 - 2³ = 13680439 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 414559 = 13680447 / (1 + 3 + 6 + 8 + 0 + 4 + 4 + 7).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13680647) 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, 207247 + ... + 207312.

It is an arithmetic number, because the mean of its divisors is an integer number (2487360).

Almost surely, 2^13680447 is an apocalyptic number.

13680447 is a deficient number, since it is larger than the sum of its proper divisors (6218433).

13680447 is a wasteful number, since it uses less digits than its factorization.

13680447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414573.

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 13680447 is about 3698.7088287671. The cubic root of 13680447 is about 239.1663611846.

The spelling of 13680447 in words is "thirteen million, six hundred eighty thousand, four hundred forty-seven".