422638817 has 2 divisors, whose sum is σ = 422638818. Its totient is φ = 422638816.

The previous prime is 422638759. The next prime is 422638849. The reversal of 422638817 is 718836224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 378535936 + 44102881 = 19456^2 + 6641^2 .

It is a cyclic number.

It is not a de Polignac number, because 422638817 - 2¹⁴ = 422622433 is a prime.

It is not a weakly prime, because it can be changed into another prime (422638877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211319408 + 211319409.

It is an arithmetic number, because the mean of its divisors is an integer number (211319409).

Almost surely, 2^422638817 is an apocalyptic number.

It is an amenable number.

422638817 is a deficient number, since it is larger than the sum of its proper divisors (1).

422638817 is an equidigital number, since it uses as much as digits as its factorization.

422638817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129024, while the sum is 41.

The square root of 422638817 is about 20558.1812668339. The cubic root of 422638817 is about 750.4523594027.

The spelling of 422638817 in words is "four hundred twenty-two million, six hundred thirty-eight thousand, eight hundred seventeen".