1828821 has 4 divisors (see below), whose sum is σ = 2438432. Its totient is φ = 1219212.

The previous prime is 1828793. The next prime is 1828829. The reversal of 1828821 is 1288281.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1288281 = 3 ⋅429427.

It is not a de Polignac number, because 1828821 - 2⁵ = 1828789 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1828829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 304801 + ... + 304806.

It is an arithmetic number, because the mean of its divisors is an integer number (609608).

2^1828821 is an apocalyptic number.

It is an amenable number.

1828821 is a deficient number, since it is larger than the sum of its proper divisors (609611).

1828821 is an equidigital number, since it uses as much as digits as its factorization.

1828821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609610.

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

The square root of 1828821 is about 1352.3390846973. The cubic root of 1828821 is about 122.2898465381.

The spelling of 1828821 in words is "one million, eight hundred twenty-eight thousand, eight hundred twenty-one".