1819221 has 8 divisors (see below), whose sum is σ = 2568384. Its totient is φ = 1141440.

The previous prime is 1819217. The next prime is 1819261. The reversal of 1819221 is 1229181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1819221 - 2² = 1819217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1819191 and 1819200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1819261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17785 + ... + 17886.

It is an arithmetic number, because the mean of its divisors is an integer number (321048).

2^1819221 is an apocalyptic number.

It is an amenable number.

1819221 is a deficient number, since it is larger than the sum of its proper divisors (749163).

1819221 is a wasteful number, since it uses less digits than its factorization.

1819221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35691.

The product of its digits is 288, while the sum is 24.

The square root of 1819221 is about 1348.7850088135. The cubic root of 1819221 is about 122.0754930051.

The spelling of 1819221 in words is "one million, eight hundred nineteen thousand, two hundred twenty-one".