2003445 has 18 divisors (see below), whose sum is σ = 3489174. Its totient is φ = 1063440.

The previous prime is 2003411. The next prime is 2003447. The reversal of 2003445 is 5443002.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1602756 + 400689 = 1266^2 + 633^2 .

It is not a de Polignac number, because 2003445 - 2⁶ = 2003381 is a prime.

2003445 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2003447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 9390 + ... + 9600.

It is an arithmetic number, because the mean of its divisors is an integer number (193843).

2^2003445 is an apocalyptic number.

It is an amenable number.

2003445 is a deficient number, since it is larger than the sum of its proper divisors (1485729).

2003445 is an equidigital number, since it uses as much as digits as its factorization.

2003445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 2003445 is about 1415.4310297574. The cubic root of 2003445 is about 126.0644039607.

Adding to 2003445 its reverse (5443002), we get a palindrome (7446447).

The spelling of 2003445 in words is "two million, three thousand, four hundred forty-five".