422806187 has 2 divisors, whose sum is σ = 422806188. Its totient is φ = 422806186.

The previous prime is 422806157. The next prime is 422806199. The reversal of 422806187 is 781608224.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 422806187 - 2⁶ = 422806123 is a prime.

It is a super-3 number, since 3×422806187³ (a number of 27 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 422806187.

It is not a weakly prime, because it can be changed into another prime (422806127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211403093 + 211403094.

It is an arithmetic number, because the mean of its divisors is an integer number (211403094).

Almost surely, 2^422806187 is an apocalyptic number.

422806187 is a deficient number, since it is larger than the sum of its proper divisors (1).

422806187 is an equidigital number, since it uses as much as digits as its factorization.

422806187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 422806187 is about 20562.2515060973. The cubic root of 422806187 is about 750.5514090166.

The spelling of 422806187 in words is "four hundred twenty-two million, eight hundred six thousand, one hundred eighty-seven".