1821232 has 60 divisors (see below), whose sum is σ = 4325616. Its totient is φ = 739200.

The previous prime is 1821191. The next prime is 1821233. The reversal of 1821232 is 2321281.

It is not an unprimeable number, because it can be changed into a prime (1821233) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17982 + ... + 18082.

2^1821232 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 1821232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2162808).

1821232 is an abundant number, since it is smaller than the sum of its proper divisors (2504384).

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

1821232 is a wasteful number, since it uses less digits than its factorization.

1821232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146 (or 133 counting only the distinct ones).

The product of its digits is 192, while the sum is 19.

The square root of 1821232 is about 1349.5302886560. The cubic root of 1821232 is about 122.1204579314.

The spelling of 1821232 in words is "one million, eight hundred twenty-one thousand, two hundred thirty-two".