442646647 has 2 divisors, whose sum is σ = 442646648. Its totient is φ = 442646646.

The previous prime is 442646609. The next prime is 442646653. The reversal of 442646647 is 746646244.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 442646647 - 2¹⁵ = 442613879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (442646147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221323323 + 221323324.

It is an arithmetic number, because the mean of its divisors is an integer number (221323324).

Almost surely, 2^442646647 is an apocalyptic number.

442646647 is a deficient number, since it is larger than the sum of its proper divisors (1).

442646647 is an equidigital number, since it uses as much as digits as its factorization.

442646647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 774144, while the sum is 43.

The square root of 442646647 is about 21039.1693514739. The cubic root of 442646647 is about 762.1124556465.

The spelling of 442646647 in words is "four hundred forty-two million, six hundred forty-six thousand, six hundred forty-seven".