1380221 has 2 divisors, whose sum is σ = 1380222. Its totient is φ = 1380220.

The previous prime is 1380199. The next prime is 1380227. The reversal of 1380221 is 1220831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 722500 + 657721 = 850^2 + 811^2 .

It is a cyclic number.

It is not a de Polignac number, because 1380221 - 2⁶ = 1380157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1380221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1380227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690110 + 690111.

It is an arithmetic number, because the mean of its divisors is an integer number (690111).

2^1380221 is an apocalyptic number.

It is an amenable number.

1380221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1380221 is an equidigital number, since it uses as much as digits as its factorization.

1380221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1380221 is about 1174.8280725281. The cubic root of 1380221 is about 111.3395710068.

The spelling of 1380221 in words is "one million, three hundred eighty thousand, two hundred twenty-one".