1122820 has 24 divisors (see below), whose sum is σ = 2435328. Its totient is φ = 434400.

The previous prime is 1122811. The next prime is 1122841. The reversal of 1122820 is 282211.

It is a junction number, because it is equal to n+sod(n) for n = 1122794 and 1122803.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 286 + ... + 1525.

It is an arithmetic number, because the mean of its divisors is an integer number (101472).

2^1122820 is an apocalyptic number.

1122820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1122820 is an abundant number, since it is smaller than the sum of its proper divisors (1312508).

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

1122820 is a wasteful number, since it uses less digits than its factorization.

1122820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1851 (or 1849 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 1122820 is about 1059.6320115965. The cubic root of 1122820 is about 103.9369687097.

The spelling of 1122820 in words is "one million, one hundred twenty-two thousand, eight hundred twenty".