1839221 has 2 divisors, whose sum is σ = 1839222. Its totient is φ = 1839220.

The previous prime is 1839203. The next prime is 1839283. The reversal of 1839221 is 1229381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1575025 + 264196 = 1255^2 + 514^2 .

It is an emirp because it is prime and its reverse (1229381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1839221 - 2¹⁴ = 1822837 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1839121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 919610 + 919611.

It is an arithmetic number, because the mean of its divisors is an integer number (919611).

2^1839221 is an apocalyptic number.

It is an amenable number.

1839221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1839221 is an equidigital number, since it uses as much as digits as its factorization.

1839221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 26.

The square root of 1839221 is about 1356.1788230171. The cubic root of 1839221 is about 122.5212180378.

The spelling of 1839221 in words is "one million, eight hundred thirty-nine thousand, two hundred twenty-one".