1806818 has 8 divisors (see below), whose sum is σ = 2918748. Its totient is φ = 833904.

The previous prime is 1806803. The next prime is 1806839. The reversal of 1806818 is 8186081.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1776889 + 29929 = 1333^2 + 173^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

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, 34721 + ... + 34772.

2^1806818 is an apocalyptic number.

1806818 is a deficient number, since it is larger than the sum of its proper divisors (1111930).

1806818 is a wasteful number, since it uses less digits than its factorization.

1806818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69508.

The product of its (nonzero) digits is 3072, while the sum is 32.

The square root of 1806818 is about 1344.1793035157. The cubic root of 1806818 is about 121.7974332646.

The spelling of 1806818 in words is "one million, eight hundred six thousand, eight hundred eighteen".