1427221 has 2 divisors, whose sum is σ = 1427222. Its totient is φ = 1427220.

The previous prime is 1427191. The next prime is 1427227. The reversal of 1427221 is 1227241.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1188100 + 239121 = 1090^2 + 489^2 .

It is an emirp because it is prime and its reverse (1227241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1427221 - 2⁷ = 1427093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1427227) 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 as a sum of consecutive naturals, namely, 713610 + 713611.

It is an arithmetic number, because the mean of its divisors is an integer number (713611).

2^1427221 is an apocalyptic number.

It is an amenable number.

1427221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1427221 is an equidigital number, since it uses as much as digits as its factorization.

1427221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 224, while the sum is 19.

The square root of 1427221 is about 1194.6635509632. The cubic root of 1427221 is about 112.5892887855.

The spelling of 1427221 in words is "one million, four hundred twenty-seven thousand, two hundred twenty-one".