423508409 has 2 divisors, whose sum is σ = 423508410. Its totient is φ = 423508408.

The previous prime is 423508387. The next prime is 423508427. The reversal of 423508409 is 904805324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 403005625 + 20502784 = 20075^2 + 4528^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-423508409 is a prime.

It is a super-2 number, since 2×423508409² = 358718744987422562, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (423508429) 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, 211754204 + 211754205.

It is an arithmetic number, because the mean of its divisors is an integer number (211754205).

Almost surely, 2^423508409 is an apocalyptic number.

It is an amenable number.

423508409 is a deficient number, since it is larger than the sum of its proper divisors (1).

423508409 is an equidigital number, since it uses as much as digits as its factorization.

423508409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 423508409 is about 20579.3199353137. The cubic root of 423508409 is about 750.9666995281.

The spelling of 423508409 in words is "four hundred twenty-three million, five hundred eight thousand, four hundred nine".