1921328 has 30 divisors (see below), whose sum is σ = 3908604. Its totient is φ = 914848.

The previous prime is 1921327. The next prime is 1921363. The reversal of 1921328 is 8231291.

It is a junction number, because it is equal to n+sod(n) for n = 1921297 and 1921306.

It is not an unprimeable number, because it can be changed into a prime (1921327) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8351 + ... + 8577.

2^1921328 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 1921328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1954302).

1921328 is an abundant number, since it is smaller than the sum of its proper divisors (1987276).

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

1921328 is a wasteful number, since it uses less digits than its factorization.

1921328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281 (or 252 counting only the distinct ones).

The product of its digits is 864, while the sum is 26.

The square root of 1921328 is about 1386.1197639454. The cubic root of 1921328 is about 124.3179492227.

The spelling of 1921328 in words is "one million, nine hundred twenty-one thousand, three hundred twenty-eight".