1216812 has 24 divisors (see below), whose sum is σ = 2931712. Its totient is φ = 392400.

The previous prime is 1216807. The next prime is 1216823. The reversal of 1216812 is 2186121.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1264 + ... + 2007.

2^1216812 is an apocalyptic number.

1216812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1216812 is an abundant number, since it is smaller than the sum of its proper divisors (1714900).

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

1216812 is a wasteful number, since it uses less digits than its factorization.

1216812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3309 (or 3307 counting only the distinct ones).

The product of its digits is 192, while the sum is 21.

The square root of 1216812 is about 1103.0920179205. The cubic root of 1216812 is about 106.7598188001.

The spelling of 1216812 in words is "one million, two hundred sixteen thousand, eight hundred twelve".