842444689 has 2 divisors, whose sum is σ = 842444690. Its totient is φ = 842444688.

The previous prime is 842444677. The next prime is 842444711. The reversal of 842444689 is 986444248.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 825700225 + 16744464 = 28735^2 + 4092^2 .

It is a cyclic number.

It is not a de Polignac number, because 842444689 - 2⁹ = 842444177 is a prime.

It is not a weakly prime, because it can be changed into another prime (842444609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421222344 + 421222345.

It is an arithmetic number, because the mean of its divisors is an integer number (421222345).

Almost surely, 2^842444689 is an apocalyptic number.

It is an amenable number.

842444689 is a deficient number, since it is larger than the sum of its proper divisors (1).

842444689 is an equidigital number, since it uses as much as digits as its factorization.

842444689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1769472, while the sum is 49.

The square root of 842444689 is about 29024.8977431446. The cubic root of 842444689 is about 944.4532503503.

The spelling of 842444689 in words is "eight hundred forty-two million, four hundred forty-four thousand, six hundred eighty-nine".