1222812 has 18 divisors (see below), whose sum is σ = 3091088. Its totient is φ = 407592.

The previous prime is 1222811. The next prime is 1222829. The reversal of 1222812 is 2182221.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16948 + ... + 17019.

2^1222812 is an apocalyptic number.

1222812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1222812 is an abundant number, since it is smaller than the sum of its proper divisors (1868276).

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

1222812 is a wasteful number, since it uses less digits than its factorization.

1222812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33977 (or 33972 counting only the distinct ones).

The product of its digits is 128, while the sum is 18.

The square root of 1222812 is about 1105.8083016509. The cubic root of 1222812 is about 106.9350058023.

The spelling of 1222812 in words is "one million, two hundred twenty-two thousand, eight hundred twelve".