1218812 has 48 divisors (see below), whose sum is σ = 2688000. Its totient is φ = 471744.

The previous prime is 1218787. The next prime is 1218821. The reversal of 1218812 is 2188121.

It is a happy number.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 15389 + ... + 15467.

It is an arithmetic number, because the mean of its divisors is an integer number (56000).

2^1218812 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1218812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1344000).

1218812 is an abundant number, since it is smaller than the sum of its proper divisors (1469188).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1218812 is a wasteful number, since it uses less digits than its factorization.

1218812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138 (or 136 counting only the distinct ones).

The product of its digits is 256, while the sum is 23.

The square root of 1218812 is about 1103.9981884043. The cubic root of 1218812 is about 106.8182783269.

The spelling of 1218812 in words is "one million, two hundred eighteen thousand, eight hundred twelve".