1242217 has 2 divisors, whose sum is σ = 1242218. Its totient is φ = 1242216.

The previous prime is 1242193. The next prime is 1242221. The reversal of 1242217 is 7122421.

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., 1073296 + 168921 = 1036^2 + 411^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242217 - 2⁷ = 1242089 is a prime.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 1242194 and 1242203.

It is not a weakly prime, because it can be changed into another prime (1242317) 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, 621108 + 621109.

It is an arithmetic number, because the mean of its divisors is an integer number (621109).

2^1242217 is an apocalyptic number.

It is an amenable number.

1242217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242217 is an equidigital number, since it uses as much as digits as its factorization.

1242217 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 1242217 is about 1114.5478904022. The cubic root of 1242217 is about 107.4976960025.

Adding to 1242217 its reverse (7122421), we get a palindrome (8364638).

The spelling of 1242217 in words is "one million, two hundred forty-two thousand, two hundred seventeen".