11947 has 4 divisors (see below), whose sum is σ = 12880. Its totient is φ = 11016.

The previous prime is 11941. The next prime is 11953. The reversal of 11947 is 74911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74911 = 23 ⋅3257.

It is an interprime number because it is at equal distance from previous prime (11941) and next prime (11953).

It is a cyclic number.

It is not a de Polignac number, because 11947 - 2³ = 11939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11941) 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, 447 + ... + 472.

It is an arithmetic number, because the mean of its divisors is an integer number (3220).

2¹¹⁹⁴⁷ is an apocalyptic number.

11947 is a deficient number, since it is larger than the sum of its proper divisors (933).

11947 is an equidigital number, since it uses as much as digits as its factorization.

11947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 932.

The product of its digits is 252, while the sum is 22.

The square root of 11947 is about 109.3023330035. The cubic root of 11947 is about 22.8605296321.

The spelling of 11947 in words is "eleven thousand, nine hundred forty-seven".