1821303 has 12 divisors (see below), whose sum is σ = 2870088. Its totient is φ = 1103760.

The previous prime is 1821289. The next prime is 1821311. The reversal of 1821303 is 3031281.

It is not a de Polignac number, because 1821303 - 2¹⁰ = 1820279 is a prime.

1821303 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1821353) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9100 + ... + 9297.

It is an arithmetic number, because the mean of its divisors is an integer number (239174).

2^1821303 is an apocalyptic number.

1821303 is a deficient number, since it is larger than the sum of its proper divisors (1048785).

1821303 is a wasteful number, since it uses less digits than its factorization.

1821303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18414 (or 18411 counting only the distinct ones).

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

The square root of 1821303 is about 1349.5565938485. The cubic root of 1821303 is about 122.1220448498.

Adding to 1821303 its reverse (3031281), we get a palindrome (4852584).

It can be divided in two parts, 182 and 1303, that added together give a triangular number (1485 = T₅₄).

The spelling of 1821303 in words is "one million, eight hundred twenty-one thousand, three hundred three".