442387289 has 2 divisors, whose sum is σ = 442387290. Its totient is φ = 442387288.

The previous prime is 442387273. The next prime is 442387321. The reversal of 442387289 is 982783244.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 340033600 + 102353689 = 18440^2 + 10117^2 .

It is a cyclic number.

It is not a de Polignac number, because 442387289 - 2⁴ = 442387273 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (442387219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221193644 + 221193645.

It is an arithmetic number, because the mean of its divisors is an integer number (221193645).

Almost surely, 2^442387289 is an apocalyptic number.

It is an amenable number.

442387289 is a deficient number, since it is larger than the sum of its proper divisors (1).

442387289 is an equidigital number, since it uses as much as digits as its factorization.

442387289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 774144, while the sum is 47.

The square root of 442387289 is about 21033.0047544330. The cubic root of 442387289 is about 761.9635795013.

The spelling of 442387289 in words is "four hundred forty-two million, three hundred eighty-seven thousand, two hundred eighty-nine".