1221822 has 24 divisors (see below), whose sum is σ = 3025776. Its totient is φ = 349056.

The previous prime is 1221821. The next prime is 1221823. The reversal of 1221822 is 2281221.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1221821) and next prime (1221823).

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

It is a junction number, because it is equal to n+sod(n) for n = 1221795 and 1221804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221821) 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 11 ways as a sum of consecutive naturals, for example, 4723 + ... + 4974.

It is an arithmetic number, because the mean of its divisors is an integer number (126074).

2^1221822 is an apocalyptic number.

1221822 is an abundant number, since it is smaller than the sum of its proper divisors (1803954).

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

1221822 is a wasteful number, since it uses less digits than its factorization.

1221822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9712 (or 9709 counting only the distinct ones).

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

The square root of 1221822 is about 1105.3605746543. The cubic root of 1221822 is about 106.9061394847.

The spelling of 1221822 in words is "one million, two hundred twenty-one thousand, eight hundred twenty-two".