11945 has 4 divisors (see below), whose sum is σ = 14340. Its totient is φ = 9552.

The previous prime is 11941. The next prime is 11953. The reversal of 11945 is 54911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54911 = 43 ⋅1277.

It can be written as a sum of positive squares in 2 ways, for example, as 3481 + 8464 = 59^2 + 92^2 .

It is a cyclic number.

It is not a de Polignac number, because 11945 - 2² = 11941 is a prime.

It is a plaindrome in base 13.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 11945.

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, 1190 + ... + 1199.

It is an arithmetic number, because the mean of its divisors is an integer number (3585).

2¹¹⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

11945 is a deficient number, since it is larger than the sum of its proper divisors (2395).

11945 is an equidigital number, since it uses as much as digits as its factorization.

11945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2394.

The product of its digits is 180, while the sum is 20.

The square root of 11945 is about 109.2931836850. The cubic root of 11945 is about 22.8592538973.

The spelling of 11945 in words is "eleven thousand, nine hundred forty-five".