1821828 has 24 divisors (see below), whose sum is σ = 4282432. Its totient is φ = 602784.

The previous prime is 1821821. The next prime is 1821847. The reversal of 1821828 is 8281281.

It is a junction number, because it is equal to n+sod(n) for n = 1821795 and 1821804.

It is not an unprimeable number, because it can be changed into a prime (1821821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1401 + ... + 2367.

2^1821828 is an apocalyptic number.

It is an amenable number.

1821828 is an abundant number, since it is smaller than the sum of its proper divisors (2460604).

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

1821828 is a wasteful number, since it uses less digits than its factorization.

1821828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1131 (or 1129 counting only the distinct ones).

The product of its digits is 2048, while the sum is 30.

The square root of 1821828 is about 1349.7510881640. The cubic root of 1821828 is about 122.1337778260.

The spelling of 1821828 in words is "one million, eight hundred twenty-one thousand, eight hundred twenty-eight".