1891328 has 22 divisors (see below), whose sum is σ = 3782856. Its totient is φ = 945152.

The previous prime is 1891319. The next prime is 1891333. The reversal of 1891328 is 8231981.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 1891294 and 1891303.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101 + ... + 1947.

It is an arithmetic number, because the mean of its divisors is an integer number (171948).

2^1891328 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 1891328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1891428).

1891328 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1891328 is an equidigital number, since it uses as much as digits as its factorization.

1891328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1867 (or 1849 counting only the distinct ones).

The product of its digits is 3456, while the sum is 32.

The square root of 1891328 is about 1375.2556126044. The cubic root of 1891328 is about 123.6675102403.

The spelling of 1891328 in words is "one million, eight hundred ninety-one thousand, three hundred twenty-eight".