1211328 has 56 divisors (see below), whose sum is σ = 3566160. Its totient is φ = 403200.

The previous prime is 1211311. The next prime is 1211333. The reversal of 1211328 is 8231121.

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 and also a Zuckerman number because it is divisible by the product of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 1211328.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1378 + ... + 2078.

2^1211328 is an apocalyptic number.

1211328 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 1211328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1783080).

1211328 is an abundant number, since it is smaller than the sum of its proper divisors (2354832).

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

1211328 is an equidigital number, since it uses as much as digits as its factorization.

1211328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722 (or 706 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

The square root of 1211328 is about 1100.6034708286. The cubic root of 1211328 is about 106.5991934391.

Adding to 1211328 its sum of digits (18), we get a triangular number (1211346 = T₁₅₅₆).

Adding to 1211328 its reverse (8231121), we get a palindrome (9442449).

The spelling of 1211328 in words is "one million, two hundred eleven thousand, three hundred twenty-eight".