2203813 has 4 divisors (see below), whose sum is σ = 2220768. Its totient is φ = 2186860.

The previous prime is 2203811. The next prime is 2203843. The reversal of 2203813 is 3183022.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3183022 = 2 ⋅1591511.

It is a cyclic number.

It is not a de Polignac number, because 2203813 - 2¹ = 2203811 is a prime.

It is an Ulam number.

It is a Duffinian number.

2203813 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2203811) 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, 8281 + ... + 8542.

It is an arithmetic number, because the mean of its divisors is an integer number (555192).

2^2203813 is an apocalyptic number.

It is an amenable number.

2203813 is a deficient number, since it is larger than the sum of its proper divisors (16955).

2203813 is a wasteful number, since it uses less digits than its factorization.

2203813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16954.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 2203813 is about 1484.5245029975. The cubic root of 2203813 is about 130.1342400322.

Adding to 2203813 its reverse (3183022), we get a palindrome (5386835).

The spelling of 2203813 in words is "two million, two hundred three thousand, eight hundred thirteen".