1220120 has 64 divisors (see below), whose sum is σ = 3110400. Its totient is φ = 426880.

The previous prime is 1220099. The next prime is 1220147. The reversal of 1220120 is 210221.

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a junction number, because it is equal to n+sod(n) for n = 1220098 and 1220107.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20651 + ... + 20709.

It is an arithmetic number, because the mean of its divisors is an integer number (48600).

2^1220120 is an apocalyptic number.

1220120 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 1220120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1555200).

1220120 is an abundant number, since it is smaller than the sum of its proper divisors (1890280).

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

1220120 is a wasteful number, since it uses less digits than its factorization.

1220120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128 (or 124 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 1220120 is about 1104.5904218306. The cubic root of 1220120 is about 106.8564762762.

Adding to 1220120 its reverse (210221), we get a palindrome (1430341).

It can be divided in two parts, 12201 and 20, that added together give a palindrome (12221).

The spelling of 1220120 in words is "one million, two hundred twenty thousand, one hundred twenty".