1790221 has 2 divisors, whose sum is σ = 1790222. Its totient is φ = 1790220.

The previous prime is 1790213. The next prime is 1790231. The reversal of 1790221 is 1220971.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1755625 + 34596 = 1325^2 + 186^2 .

It is a cyclic number.

It is not a de Polignac number, because 1790221 - 2³ = 1790213 is a prime.

It is a Chen prime.

1790221 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1790192 and 1790201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1790231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 895110 + 895111.

It is an arithmetic number, because the mean of its divisors is an integer number (895111).

2^1790221 is an apocalyptic number.

It is an amenable number.

1790221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1790221 is an equidigital number, since it uses as much as digits as its factorization.

1790221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 1790221 is about 1337.9914050546. The cubic root of 1790221 is about 121.4233514316.

The spelling of 1790221 in words is "one million, seven hundred ninety thousand, two hundred twenty-one".