442807861 has 2 divisors, whose sum is σ = 442807862. Its totient is φ = 442807860.

The previous prime is 442807847. The next prime is 442807909. The reversal of 442807861 is 168708244.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 437019025 + 5788836 = 20905^2 + 2406^2 .

It is a cyclic number.

It is not a de Polignac number, because 442807861 - 2⁵ = 442807829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (442807811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221403930 + 221403931.

It is an arithmetic number, because the mean of its divisors is an integer number (221403931).

Almost surely, 2^442807861 is an apocalyptic number.

It is an amenable number.

442807861 is a deficient number, since it is larger than the sum of its proper divisors (1).

442807861 is an equidigital number, since it uses as much as digits as its factorization.

442807861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 86016, while the sum is 40.

The square root of 442807861 is about 21043.0002851304. Note that the first 3 decimals coincide. The cubic root of 442807861 is about 762.2049660687.

The spelling of 442807861 in words is "four hundred forty-two million, eight hundred seven thousand, eight hundred sixty-one".