442638023 has 2 divisors, whose sum is σ = 442638024. Its totient is φ = 442638022.

The previous prime is 442637999. The next prime is 442638083. The reversal of 442638023 is 320836244.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 442638023 - 2²⁴ = 425860807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (442638083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221319011 + 221319012.

It is an arithmetic number, because the mean of its divisors is an integer number (221319012).

Almost surely, 2^442638023 is an apocalyptic number.

442638023 is a deficient number, since it is larger than the sum of its proper divisors (1).

442638023 is an equidigital number, since it uses as much as digits as its factorization.

442638023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 32.

The square root of 442638023 is about 21038.9643994185. The cubic root of 442638023 is about 762.1075062506.

The spelling of 442638023 in words is "four hundred forty-two million, six hundred thirty-eight thousand, twenty-three".