13947 has 4 divisors (see below), whose sum is σ = 18600. Its totient is φ = 9296.

The previous prime is 13933. The next prime is 13963. The reversal of 13947 is 74931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74931 = 3 ⋅24977.

It is a cyclic number.

It is not a de Polignac number, because 13947 - 2⁴ = 13931 is a prime.

It is a D-number.

13947 is a lucky number.

It is a plaindrome in base 16.

It is a nialpdrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (13907) 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, 2322 + ... + 2327.

It is an arithmetic number, because the mean of its divisors is an integer number (4650).

2¹³⁹⁴⁷ is an apocalyptic number.

13947 is a deficient number, since it is larger than the sum of its proper divisors (4653).

13947 is an equidigital number, since it uses as much as digits as its factorization.

13947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4652.

The product of its digits is 756, while the sum is 24.

The square root of 13947 is about 118.0974174146. The cubic root of 13947 is about 24.0709704816.

The spelling of 13947 in words is "thirteen thousand, nine hundred forty-seven".