1811218 has 8 divisors (see below), whose sum is σ = 2731212. Its totient is φ = 900816.

The previous prime is 1811209. The next prime is 1811219. The reversal of 1811218 is 8121181.

It can be written as a sum of positive squares in 2 ways, for example, as 1803649 + 7569 = 1343^2 + 87^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1811219) 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, 1905 + ... + 2692.

2^1811218 is an apocalyptic number.

1811218 is a deficient number, since it is larger than the sum of its proper divisors (919994).

1811218 is a wasteful number, since it uses less digits than its factorization.

1811218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4796.

The product of its digits is 128, while the sum is 22.

The square root of 1811218 is about 1345.8149947151. The cubic root of 1811218 is about 121.8962209815.

Adding to 1811218 its reverse (8121181), we get a palindrome (9932399).

It can be divided in two parts, 18 and 11218, that added together give a square (11236 = 106²).

The spelling of 1811218 in words is "one million, eight hundred eleven thousand, two hundred eighteen".