442398991 has 2 divisors, whose sum is σ = 442398992. Its totient is φ = 442398990.

The previous prime is 442398977. The next prime is 442399019. The reversal of 442398991 is 199893244.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 442398991 - 2⁵ = 442398959 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (442398911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221199495 + 221199496.

It is an arithmetic number, because the mean of its divisors is an integer number (221199496).

Almost surely, 2^442398991 is an apocalyptic number.

442398991 is a deficient number, since it is larger than the sum of its proper divisors (1).

442398991 is an equidigital number, since it uses as much as digits as its factorization.

442398991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 49.

The square root of 442398991 is about 21033.2829344351. The cubic root of 442398991 is about 761.9702979125.

The spelling of 442398991 in words is "four hundred forty-two million, three hundred ninety-eight thousand, nine hundred ninety-one".