5445 has 18 divisors (see below), whose sum is σ = 10374.
Its totient is φ = 2640.
The previous prime is 5443. The next prime is 5449.
It is a happy number.
5445 is nontrivially palindromic in base 10.
It can be written as a sum of positive squares in only one way, i.e., 4356 + 1089 = 66^2 + 33^2
It is not a de Polignac number, because 5445 - 21 = 5443 is a prime.
It is a Curzon number.
It is a nialpdrome in base 9 and base 11.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (5441) by changing a digit.
It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 490 + ... + 500.
25445 is an apocalyptic number.
5445 is a gapful number since it is divisible by the number (55) formed by its first and last digit.
It is an amenable number.
5445 is a deficient number, since it is larger than the sum of its proper divisors (4929).
5445 is a wasteful number, since it uses less digits than its factorization.
5445 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 33 (or 19 counting only the distinct ones).
The product of its digits is 400, while the sum is 18.
The square root of 5445 is about 73.7902432575.
The cubic root of 5445 is about 17.5927053103.
It can be divided in two parts, 54 and 45, that added together give a palindrome (99).
The spelling of 5445 in words is "five thousand, four hundred forty-five".