1940221 has 2 divisors, whose sum is σ = 1940222. Its totient is φ = 1940220.

The previous prime is 1940219. The next prime is 1940233. The reversal of 1940221 is 1220491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1028196 + 912025 = 1014^2 + 955^2 .

It is an emirp because it is prime and its reverse (1220491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1940221 - 2¹ = 1940219 is a prime.

Together with 1940219, it forms a pair of twin primes.

1940221 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1940201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 970110 + 970111.

It is an arithmetic number, because the mean of its divisors is an integer number (970111).

2^1940221 is an apocalyptic number.

It is an amenable number.

1940221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1940221 is an equidigital number, since it uses as much as digits as its factorization.

1940221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 1940221 is about 1392.9181598357. The cubic root of 1940221 is about 124.7241061755.

The spelling of 1940221 in words is "one million, nine hundred forty thousand, two hundred twenty-one".