442791689 has 2 divisors, whose sum is σ = 442791690. Its totient is φ = 442791688.

The previous prime is 442791641. The next prime is 442791721. The reversal of 442791689 is 986197244.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 226201600 + 216590089 = 15040^2 + 14717^2 .

It is a cyclic number.

It is not a de Polignac number, because 442791689 - 2¹⁶ = 442726153 is a prime.

It is not a weakly prime, because it can be changed into another prime (442791389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221395844 + 221395845.

It is an arithmetic number, because the mean of its divisors is an integer number (221395845).

Almost surely, 2^442791689 is an apocalyptic number.

It is an amenable number.

442791689 is a deficient number, since it is larger than the sum of its proper divisors (1).

442791689 is an equidigital number, since it uses as much as digits as its factorization.

442791689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 50.

The square root of 442791689 is about 21042.6160208278. The cubic root of 442791689 is about 762.1956870037.

The spelling of 442791689 in words is "four hundred forty-two million, seven hundred ninety-one thousand, six hundred eighty-nine".