22740217 has 2 divisors, whose sum is σ = 22740218. Its totient is φ = 22740216.

The previous prime is 22740209. The next prime is 22740227. The reversal of 22740217 is 71204722.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22695696 + 44521 = 4764^2 + 211^2 .

It is a cyclic number.

It is not a de Polignac number, because 22740217 - 2³ = 22740209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22740191 and 22740200.

It is not a weakly prime, because it can be changed into another prime (22740227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11370108 + 11370109.

It is an arithmetic number, because the mean of its divisors is an integer number (11370109).

Almost surely, 2^22740217 is an apocalyptic number.

It is an amenable number.

22740217 is a deficient number, since it is larger than the sum of its proper divisors (1).

22740217 is an equidigital number, since it uses as much as digits as its factorization.

22740217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1568, while the sum is 25.

The square root of 22740217 is about 4768.6703597544. The cubic root of 22740217 is about 283.3119336394.

Adding to 22740217 its reverse (71204722), we get a palindrome (93944939).

The spelling of 22740217 in words is "twenty-two million, seven hundred forty thousand, two hundred seventeen".