13445 has 4 divisors (see below), whose sum is σ = 16140. Its totient is φ = 10752.

The previous prime is 13441. The next prime is 13451. The reversal of 13445 is 54431.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2209 + 11236 = 47^2 + 106^2 .

It is a cyclic number.

It is not a de Polignac number, because 13445 - 2² = 13441 is a prime.

It is a Curzon number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13441) 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, 1340 + ... + 1349.

It is an arithmetic number, because the mean of its divisors is an integer number (4035).

2¹³⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

13445 is a deficient number, since it is larger than the sum of its proper divisors (2695).

13445 is an equidigital number, since it uses as much as digits as its factorization.

13445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2694.

The product of its digits is 240, while the sum is 17.

The square root of 13445 is about 115.9525765130. The cubic root of 13445 is about 23.7786358195.

Adding to 13445 its reverse (54431), we get a palindrome (67876).

The spelling of 13445 in words is "thirteen thousand, four hundred forty-five".