1218188 has 12 divisors (see below), whose sum is σ = 2189712. Its totient is φ = 592560.

The previous prime is 1218179. The next prime is 1218197. The reversal of 1218188 is 8818121.

It is an interprime number because it is at equal distance from previous prime (1218179) and next prime (1218197).

It is a self number, because there is not a number n which added to its sum of digits gives 1218188.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3968 + ... + 4263.

It is an arithmetic number, because the mean of its divisors is an integer number (182476).

2^1218188 is an apocalyptic number.

It is an amenable number.

1218188 is a deficient number, since it is larger than the sum of its proper divisors (971524).

1218188 is a wasteful number, since it uses less digits than its factorization.

1218188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8272 (or 8270 counting only the distinct ones).

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

The square root of 1218188 is about 1103.7155430635. The cubic root of 1218188 is about 106.8000458229.

The spelling of 1218188 in words is "one million, two hundred eighteen thousand, one hundred eighty-eight".