423245639 has 2 divisors, whose sum is σ = 423245640. Its totient is φ = 423245638.

The previous prime is 423245593. The next prime is 423245659. The reversal of 423245639 is 936542324.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 423245639 - 2²⁰ = 422197063 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423245659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211622819 + 211622820.

It is an arithmetic number, because the mean of its divisors is an integer number (211622820).

Almost surely, 2^423245639 is an apocalyptic number.

423245639 is a deficient number, since it is larger than the sum of its proper divisors (1).

423245639 is an equidigital number, since it uses as much as digits as its factorization.

423245639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 38.

The square root of 423245639 is about 20572.9346229458. The cubic root of 423245639 is about 750.8113524782.

The spelling of 423245639 in words is "four hundred twenty-three million, two hundred forty-five thousand, six hundred thirty-nine".