1211812 has 24 divisors (see below), whose sum is σ = 2451456. Its totient is φ = 513408.

The previous prime is 1211807. The next prime is 1211813. The reversal of 1211812 is 2181121.

It is not an unprimeable number, because it can be changed into a prime (1211813) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2973 + ... + 3355.

It is an arithmetic number, because the mean of its divisors is an integer number (102144).

2^1211812 is an apocalyptic number.

It is an amenable number.

1211812 is an abundant number, since it is smaller than the sum of its proper divisors (1239644).

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

1211812 is a wasteful number, since it uses less digits than its factorization.

1211812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507 (or 505 counting only the distinct ones).

The product of its digits is 32, while the sum is 16.

The square root of 1211812 is about 1100.8233282412. The cubic root of 1211812 is about 106.6133891922.

Adding to 1211812 its reverse (2181121), we get a palindrome (3392933).

The spelling of 1211812 in words is "one million, two hundred eleven thousand, eight hundred twelve".