1881328 has 20 divisors (see below), whose sum is σ = 3763648. Its totient is φ = 910080.

The previous prime is 1881311. The next prime is 1881329. The reversal of 1881328 is 8231881.

1881328 is an admirable number.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a self number, because there is not a number n which added to its sum of digits gives 1881328.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1881329) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1401 + ... + 2392.

2^1881328 is an apocalyptic number.

It is an amenable number.

1881328 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.

1881328 is a wasteful number, since it uses less digits than its factorization.

1881328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3832 (or 3826 counting only the distinct ones).

The product of its digits is 3072, while the sum is 31.

The square root of 1881328 is about 1371.6151063618. The cubic root of 1881328 is about 123.4491696386.

It can be divided in two parts, 1881 and 328, that added together give a square (2209 = 47²).

The spelling of 1881328 in words is "one million, eight hundred eighty-one thousand, three hundred twenty-eight".