1808423 has 4 divisors (see below), whose sum is σ = 1811160. Its totient is φ = 1805688.

The previous prime is 1808399. The next prime is 1808431. The reversal of 1808423 is 3248081.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1808423 - 2⁸ = 1808167 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1808392 and 1808401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1808453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 308 + ... + 1926.

It is an arithmetic number, because the mean of its divisors is an integer number (452790).

2^1808423 is an apocalyptic number.

1808423 is a deficient number, since it is larger than the sum of its proper divisors (2737).

1808423 is a wasteful number, since it uses less digits than its factorization.

1808423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2736.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 1808423 is about 1344.7761895572. The cubic root of 1808423 is about 121.8334868914.

The spelling of 1808423 in words is "one million, eight hundred eight thousand, four hundred twenty-three".