402222217 has 2 divisors, whose sum is σ = 402222218. Its totient is φ = 402222216.

The previous prime is 402222169. The next prime is 402222221. The reversal of 402222217 is 712222204.

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., 278923401 + 123298816 = 16701^2 + 11104^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402222217 is a prime.

It is not a weakly prime, because it can be changed into another prime (402222277) 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, 201111108 + 201111109.

It is an arithmetic number, because the mean of its divisors is an integer number (201111109).

Almost surely, 2^402222217 is an apocalyptic number.

It is an amenable number.

402222217 is a deficient number, since it is larger than the sum of its proper divisors (1).

402222217 is an equidigital number, since it uses as much as digits as its factorization.

402222217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 22.

The square root of 402222217 is about 20055.4784784607. The cubic root of 402222217 is about 738.1682336434.

The spelling of 402222217 in words is "four hundred two million, two hundred twenty-two thousand, two hundred seventeen".