1801128 has 64 divisors (see below), whose sum is σ = 5253120. Its totient is φ = 504000.

The previous prime is 1801117. The next prime is 1801187. The reversal of 1801128 is 8211081.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11853 + ... + 12003.

It is an arithmetic number, because the mean of its divisors is an integer number (82080).

2^1801128 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 1801128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2626560).

1801128 is an abundant number, since it is smaller than the sum of its proper divisors (3451992).

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

1801128 is a wasteful number, since it uses less digits than its factorization.

1801128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238 (or 234 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 21.

The square root of 1801128 is about 1342.0611014406. The cubic root of 1801128 is about 121.6694446938.

The spelling of 1801128 in words is "one million, eight hundred one thousand, one hundred twenty-eight".