1813203 has 24 divisors (see below), whose sum is σ = 3171168. Its totient is φ = 974592.

The previous prime is 1813177. The next prime is 1813211. The reversal of 1813203 is 3023181.

It is not a de Polignac number, because 1813203 - 2⁶ = 1813139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1813223) 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 23 ways as a sum of consecutive naturals, for example, 225 + ... + 1917.

It is an arithmetic number, because the mean of its divisors is an integer number (132132).

2^1813203 is an apocalyptic number.

1813203 is a deficient number, since it is larger than the sum of its proper divisors (1357965).

1813203 is a wasteful number, since it uses less digits than its factorization.

1813203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1723 (or 1720 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1813203 is about 1346.5522641175. The cubic root of 1813203 is about 121.9407353468.

Adding to 1813203 its reverse (3023181), we get a palindrome (4836384).

It can be divided in two parts, 1813 and 203, that added together give a triangular number (2016 = T₆₃).

The spelling of 1813203 in words is "one million, eight hundred thirteen thousand, two hundred three".