423823217 has 2 divisors, whose sum is σ = 423823218. Its totient is φ = 423823216.

The previous prime is 423823207. The next prime is 423823249. The reversal of 423823217 is 712328324.

It is an a-pointer prime, because the next prime (423823249) can be obtained adding 423823217 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 411927616 + 11895601 = 20296^2 + 3449^2 .

It is a cyclic number.

It is not a de Polignac number, because 423823217 - 2⁴ = 423823201 is a prime.

It is a super-2 number, since 2×423823217² = 359252238536458178, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (423823207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211911608 + 211911609.

It is an arithmetic number, because the mean of its divisors is an integer number (211911609).

Almost surely, 2^423823217 is an apocalyptic number.

It is an amenable number.

423823217 is a deficient number, since it is larger than the sum of its proper divisors (1).

423823217 is an equidigital number, since it uses as much as digits as its factorization.

423823217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 32.

The square root of 423823217 is about 20586.9671637179. The cubic root of 423823217 is about 751.1527263512.

The spelling of 423823217 in words is "four hundred twenty-three million, eight hundred twenty-three thousand, two hundred seventeen".