1222820 has 12 divisors (see below), whose sum is σ = 2567964. Its totient is φ = 489120.

The previous prime is 1222811. The next prime is 1222829. The reversal of 1222820 is 282221.

It is an interprime number because it is at equal distance from previous prime (1222811) and next prime (1222829).

It can be written as a sum of positive squares in 2 ways, for example, as 872356 + 350464 = 934^2 + 592^2 .

It is not an unprimeable number, because it can be changed into a prime (1222829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30551 + ... + 30590.

It is an arithmetic number, because the mean of its divisors is an integer number (213997).

2^1222820 is an apocalyptic number.

1222820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1222820 is an abundant number, since it is smaller than the sum of its proper divisors (1345144).

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

1222820 is a wasteful number, since it uses less digits than its factorization.

1222820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61150 (or 61148 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 1222820 is about 1105.8119189085. The cubic root of 1222820 is about 106.9352390020.

The spelling of 1222820 in words is "one million, two hundred twenty-two thousand, eight hundred twenty".