442791389 has 2 divisors, whose sum is σ = 442791390. Its totient is φ = 442791388.

The previous prime is 442791353. The next prime is 442791449. The reversal of 442791389 is 983197244.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 250747225 + 192044164 = 15835^2 + 13858^2 .

It is a cyclic number.

It is not a de Polignac number, because 442791389 - 2⁸ = 442791133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (442791689) 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, 221395694 + 221395695.

It is an arithmetic number, because the mean of its divisors is an integer number (221395695).

Almost surely, 2^442791389 is an apocalyptic number.

It is an amenable number.

442791389 is a deficient number, since it is larger than the sum of its proper divisors (1).

442791389 is an equidigital number, since it uses as much as digits as its factorization.

442791389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 47.

The square root of 442791389 is about 21042.6088924354. The cubic root of 442791389 is about 762.1955148695.

The spelling of 442791389 in words is "four hundred forty-two million, seven hundred ninety-one thousand, three hundred eighty-nine".