423218959 has 2 divisors, whose sum is σ = 423218960. Its totient is φ = 423218958.

The previous prime is 423218921. The next prime is 423218981. The reversal of 423218959 is 959812324.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 423218959 - 2²⁷ = 289001231 is a prime.

It is a super-2 number, since 2×423218959² = 358228574514087362, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423218759) 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, 211609479 + 211609480.

It is an arithmetic number, because the mean of its divisors is an integer number (211609480).

Almost surely, 2^423218959 is an apocalyptic number.

423218959 is a deficient number, since it is larger than the sum of its proper divisors (1).

423218959 is an equidigital number, since it uses as much as digits as its factorization.

423218959 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 43.

The square root of 423218959 is about 20572.2861879763. The cubic root of 423218959 is about 750.7955759283.

The spelling of 423218959 in words is "four hundred twenty-three million, two hundred eighteen thousand, nine hundred fifty-nine".