1811128 has 24 divisors (see below), whose sum is σ = 3734640. Its totient is φ = 822800.

The previous prime is 1811119. The next prime is 1811141. The reversal of 1811128 is 8211181.

It is a Harshad number since it is a multiple of its sum of digits (22).

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

It is a junction number, because it is equal to n+sod(n) for n = 1811099 and 1811108.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33 + ... + 1903.

It is an arithmetic number, because the mean of its divisors is an integer number (155610).

2^1811128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1811128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1867320).

1811128 is an abundant number, since it is smaller than the sum of its proper divisors (1923512).

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

1811128 is a wasteful number, since it uses less digits than its factorization.

1811128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1899 (or 1884 counting only the distinct ones).

The product of its digits is 128, while the sum is 22.

The square root of 1811128 is about 1345.7815573116. The cubic root of 1811128 is about 121.8942019274.

The spelling of 1811128 in words is "one million, eight hundred eleven thousand, one hundred twenty-eight".