1828221 has 4 divisors (see below), whose sum is σ = 2437632. Its totient is φ = 1218812.

The previous prime is 1828217. The next prime is 1828223. The reversal of 1828221 is 1228281.

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.

It is a cyclic number.

It is not a de Polignac number, because 1828221 - 2² = 1828217 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 1828191 and 1828200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1828223) 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, 304701 + ... + 304706.

It is an arithmetic number, because the mean of its divisors is an integer number (609408).

2^1828221 is an apocalyptic number.

It is an amenable number.

1828221 is a deficient number, since it is larger than the sum of its proper divisors (609411).

1828221 is an equidigital number, since it uses as much as digits as its factorization.

1828221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609410.

The product of its digits is 512, while the sum is 24.

The square root of 1828221 is about 1352.1172286455. The cubic root of 1828221 is about 122.2764714486.

The spelling of 1828221 in words is "one million, eight hundred twenty-eight thousand, two hundred twenty-one".