1809103 has 4 divisors (see below), whose sum is σ = 1829520. Its totient is φ = 1788688.

The previous prime is 1809097. The next prime is 1809113. The reversal of 1809103 is 3019081.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1809103 - 2¹⁷ = 1678031 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 (1809113) 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, 10075 + ... + 10252.

It is an arithmetic number, because the mean of its divisors is an integer number (457380).

2^1809103 is an apocalyptic number.

1809103 is a deficient number, since it is larger than the sum of its proper divisors (20417).

1809103 is an equidigital number, since it uses as much as digits as its factorization.

1809103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20416.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 1809103 is about 1345.0289959700. The cubic root of 1809103 is about 121.8487555148.

Subtracting from 1809103 its sum of digits (22), we obtain a palindrome (1809081).

The spelling of 1809103 in words is "one million, eight hundred nine thousand, one hundred three".