2445 has 8 divisors (see below), whose sum is σ = 3936.
Its totient is φ = 1296.
The previous prime is 2441. The next prime is 2447. The reversal of 2445 is 5442.
Adding to 2445 its reverse (5442), we get a palindrome (7887).
2445 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a sphenic number, since it is the product of 3 distinct primes.
It is not a de Polignac number, because 2445 - 22 = 2441 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (15), and also a Moran number because the ratio is a prime number: 163 = 2445 / (2 + 4 + 4 + 5).
It is an Ulam number.
It is a d-powerful number, because it can be written as 211 + 42 + 44 + 53 .
2445 is a lucky 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 (2441) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67 + ... + 96.
It is an arithmetic number, because the mean of its divisors is an integer number (492).
22445 is an apocalyptic number.
It is an amenable number.
2445 is a deficient number, since it is larger than the sum of its proper divisors (1491).
2445 is a wasteful number, since it uses less digits than its factorization.
2445 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 171.
The product of its digits is 160, while the sum is 15.
The square root of 2445 is about 49.4469412603.
The cubic root of 2445 is about 13.4718205066.
The spelling of 2445 in words is "two thousand, four hundred forty-five".