2503813 has 4 divisors (see below), whose sum is σ = 2696428. Its totient is φ = 2311200.

The previous prime is 2503799. The next prime is 2503817. The reversal of 2503813 is 3183052.

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 334084 + 2169729 = 578^2 + 1473^2 .

It is a cyclic number.

It is not a de Polignac number, because 2503813 - 2¹³ = 2495621 is a prime.

It is a Duffinian number.

2503813 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2503817) 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, 96288 + ... + 96313.

It is an arithmetic number, because the mean of its divisors is an integer number (674107).

2^2503813 is an apocalyptic number.

It is an amenable number.

2503813 is a deficient number, since it is larger than the sum of its proper divisors (192615).

2503813 is a wasteful number, since it uses less digits than its factorization.

2503813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192614.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 2503813 is about 1582.3441471437. The cubic root of 2503813 is about 135.7898462754.

Adding to 2503813 its reverse (3183052), we get a palindrome (5686865).

The spelling of 2503813 in words is "two million, five hundred three thousand, eight hundred thirteen".