1220112 has 60 divisors (see below), whose sum is σ = 3522220. Its totient is φ = 393984.

The previous prime is 1220099. The next prime is 1220147. The reversal of 1220112 is 2110221.

It can be written as a sum of positive squares in 2 ways, for example, as 1115136 + 104976 = 1056^2 + 324^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1220094 and 1220103.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5214 + ... + 5442.

2^1220112 is an apocalyptic number.

1220112 is a gapful number since it is divisible by the number (12) 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 1220112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1761110).

1220112 is an abundant number, since it is smaller than the sum of its proper divisors (2302108).

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

1220112 is a wasteful number, since it uses less digits than its factorization.

1220112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280 (or 271 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1220112 is about 1104.5868005730. The cubic root of 1220112 is about 106.8562427326.

Adding to 1220112 its reverse (2110221), we get a palindrome (3330333).

The spelling of 1220112 in words is "one million, two hundred twenty thousand, one hundred twelve".