423021329 has 2 divisors, whose sum is σ = 423021330. Its totient is φ = 423021328.

The previous prime is 423021323. The next prime is 423021371. The reversal of 423021329 is 923120324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 422220304 + 801025 = 20548^2 + 895^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-423021329 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 423021298 and 423021307.

It is not a weakly prime, because it can be changed into another prime (423021323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211510664 + 211510665.

It is an arithmetic number, because the mean of its divisors is an integer number (211510665).

Almost surely, 2^423021329 is an apocalyptic number.

It is an amenable number.

423021329 is a deficient number, since it is larger than the sum of its proper divisors (1).

423021329 is an equidigital number, since it uses as much as digits as its factorization.

423021329 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 423021329 is about 20567.4823204008. The cubic root of 423021329 is about 750.6786917255.

The spelling of 423021329 in words is "four hundred twenty-three million, twenty-one thousand, three hundred twenty-nine".