12402217 has 2 divisors, whose sum is σ = 12402218. Its totient is φ = 12402216.

The previous prime is 12402191. The next prime is 12402223. The reversal of 12402217 is 71220421.

It is a happy number.

12402217 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8976016 + 3426201 = 2996^2 + 1851^2 .

It is an emirp because it is prime and its reverse (71220421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12402217 - 2¹¹ = 12400169 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12402194 and 12402203.

It is not a weakly prime, because it can be changed into another prime (12402287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6201108 + 6201109.

It is an arithmetic number, because the mean of its divisors is an integer number (6201109).

Almost surely, 2^12402217 is an apocalyptic number.

It is an amenable number.

12402217 is a deficient number, since it is larger than the sum of its proper divisors (1).

12402217 is an equidigital number, since it uses as much as digits as its factorization.

12402217 is an evil number, because the sum of its binary digits is even.

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

The square root of 12402217 is about 3521.6781511092. The cubic root of 12402217 is about 231.4726988347.

Adding to 12402217 its reverse (71220421), we get a palindrome (83622638).

The spelling of 12402217 in words is "twelve million, four hundred two thousand, two hundred seventeen".