1803818 has 4 divisors (see below), whose sum is σ = 2705730. Its totient is φ = 901908.

The previous prime is 1803817. The next prime is 1803863. The reversal of 1803818 is 8183081.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8183081 = 73 ⋅112097.

It can be written as a sum of positive squares in only one way, i.e., 1803649 + 169 = 1343^2 + 13^2 .

It is not an unprimeable number, because it can be changed into a prime (1803811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 450953 + ... + 450956.

2^1803818 is an apocalyptic number.

1803818 is a deficient number, since it is larger than the sum of its proper divisors (901912).

1803818 is an equidigital number, since it uses as much as digits as its factorization.

1803818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901911.

The product of its (nonzero) digits is 1536, while the sum is 29.

The square root of 1803818 is about 1343.0629173646. The cubic root of 1803818 is about 121.7299860146.

Adding to 1803818 its reverse (8183081), we get a palindrome (9986899).

The spelling of 1803818 in words is "one million, eight hundred three thousand, eight hundred eighteen".