1218818 has 8 divisors (see below), whose sum is σ = 1844748. Its totient is φ = 603904.

The previous prime is 1218787. The next prime is 1218821. The reversal of 1218818 is 8188121.

It can be written as a sum of positive squares in 2 ways, for example, as 1216609 + 2209 = 1103^2 + 47^2 .

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 (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2471 + ... + 2922.

2^1218818 is an apocalyptic number.

1218818 is a deficient number, since it is larger than the sum of its proper divisors (625930).

1218818 is a wasteful number, since it uses less digits than its factorization.

1218818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5508.

The product of its digits is 1024, while the sum is 29.

The square root of 1218818 is about 1104.0009057967. Note that the first 3 decimals coincide. The cubic root of 1218818 is about 106.8184536092.

The spelling of 1218818 in words is "one million, two hundred eighteen thousand, eight hundred eighteen".