1022720 has 72 divisors (see below), whose sum is σ = 2649024. Its totient is φ = 376832.

The previous prime is 1022719. The next prime is 1022729. The reversal of 1022720 is 272201.

It is a junction number, because it is equal to n+sod(n) for n = 1022695 and 1022704.

It is not an unprimeable number, because it can be changed into a prime (1022729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21737 + ... + 21783.

It is an arithmetic number, because the mean of its divisors is an integer number (36792).

2^1022720 is an apocalyptic number.

1022720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1022720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1324512).

1022720 is an abundant number, since it is smaller than the sum of its proper divisors (1626304).

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

1022720 is an equidigital number, since it uses as much as digits as its factorization.

1022720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85 (or 71 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 14.

The square root of 1022720 is about 1011.2961979559. The cubic root of 1022720 is about 100.7516691122.

Adding to 1022720 its reverse (272201), we get a palindrome (1294921).

The spelling of 1022720 in words is "one million, twenty-two thousand, seven hundred twenty".