1222128 has 100 divisors (see below), whose sum is σ = 3781008. Its totient is φ = 380160.

The previous prime is 1222097. The next prime is 1222129. The reversal of 1222128 is 8212221.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is a nialpdrome in base 6.

It is a self number, because there is not a number n which added to its sum of digits gives 1222128.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222129) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 29788 + ... + 29828.

2^1222128 is an apocalyptic number.

1222128 is a gapful number since it is divisible by the number (18) 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 1222128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1890504).

1222128 is an abundant number, since it is smaller than the sum of its proper divisors (2558880).

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

1222128 is a wasteful number, since it uses less digits than its factorization.

1222128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84 (or 69 counting only the distinct ones).

The product of its digits is 128, while the sum is 18.

The square root of 1222128 is about 1105.4989823605. The cubic root of 1222128 is about 106.9150634655.

1222128 divided by its sum of digits (18) gives a triangular number (67896 = T₃₆₈).

Adding to 1222128 its reverse (8212221), we get a palindrome (9434349).

The spelling of 1222128 in words is "one million, two hundred twenty-two thousand, one hundred twenty-eight".