423205019 has 2 divisors, whose sum is σ = 423205020. Its totient is φ = 423205018.

The previous prime is 423204997. The next prime is 423205051. The reversal of 423205019 is 910502324.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-423205019 is a prime.

It is a super-2 number, since 2×423205019² = 358204976213580722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (423205319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211602509 + 211602510.

It is an arithmetic number, because the mean of its divisors is an integer number (211602510).

Almost surely, 2^423205019 is an apocalyptic number.

423205019 is a deficient number, since it is larger than the sum of its proper divisors (1).

423205019 is an equidigital number, since it uses as much as digits as its factorization.

423205019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 423205019 is about 20571.9473798666. The cubic root of 423205019 is about 750.7873325947.

The spelling of 423205019 in words is "four hundred twenty-three million, two hundred five thousand, nineteen".