1789221 has 8 divisors (see below), whose sum is σ = 2726464. Its totient is φ = 1022400.

The previous prime is 1789219. The next prime is 1789223. The reversal of 1789221 is 1229871.

It is an interprime number because it is at equal distance from previous prime (1789219) and next prime (1789223).

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

It is not a de Polignac number, because 1789221 - 2¹ = 1789219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1789223) 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, 42580 + ... + 42621.

It is an arithmetic number, because the mean of its divisors is an integer number (340808).

2^1789221 is an apocalyptic number.

It is an amenable number.

1789221 is a deficient number, since it is larger than the sum of its proper divisors (937243).

1789221 is an equidigital number, since it uses as much as digits as its factorization.

1789221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85211.

The product of its digits is 2016, while the sum is 30.

The square root of 1789221 is about 1337.6176583763. The cubic root of 1789221 is about 121.4007385871.

The spelling of 1789221 in words is "one million, seven hundred eighty-nine thousand, two hundred twenty-one".