2003123405 has 8 divisors (see below), whose sum is σ = 2427548184. Its totient is φ = 1586632000.

The previous prime is 2003123401. The next prime is 2003123459. The reversal of 2003123405 is 5043213002.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1385998441 + 617124964 = 37229^2 + 24842^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2003123405 - 2² = 2003123401 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2003123401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1982786 + ... + 1983795.

It is an arithmetic number, because the mean of its divisors is an integer number (303443523).

Almost surely, 2^2003123405 is an apocalyptic number.

It is an amenable number.

2003123405 is a deficient number, since it is larger than the sum of its proper divisors (424424779).

2003123405 is a wasteful number, since it uses less digits than its factorization.

2003123405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3966687.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 2003123405 is about 44756.2666561902. The cubic root of 2003123405 is about 1260.5765827153.

Adding to 2003123405 its reverse (5043213002), we get a palindrome (7046336407).

The spelling of 2003123405 in words is "two billion, three million, one hundred twenty-three thousand, four hundred five".