423439439 has 2 divisors, whose sum is σ = 423439440. Its totient is φ = 423439438.

The previous prime is 423439391. The next prime is 423439481. The reversal of 423439439 is 934934324.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 423439439 - 2²⁰ = 422390863 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 423439396 and 423439405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423439139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211719719 + 211719720.

It is an arithmetic number, because the mean of its divisors is an integer number (211719720).

Almost surely, 2^423439439 is an apocalyptic number.

423439439 is a deficient number, since it is larger than the sum of its proper divisors (1).

423439439 is an equidigital number, since it uses as much as digits as its factorization.

423439439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 41.

The square root of 423439439 is about 20577.6441557337. The cubic root of 423439439 is about 750.9259313607.

The spelling of 423439439 in words is "four hundred twenty-three million, four hundred thirty-nine thousand, four hundred thirty-nine".