442817 has 2 divisors, whose sum is σ = 442818. Its totient is φ = 442816.

The previous prime is 442807. The next prime is 442823. The reversal of 442817 is 718244.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 341056 + 101761 = 584^2 + 319^2 .

It is a cyclic number.

It is not a de Polignac number, because 442817 - 2⁶ = 442753 is a prime.

It is not a weakly prime, because it can be changed into another prime (442807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221408 + 221409.

It is an arithmetic number, because the mean of its divisors is an integer number (221409).

2⁴⁴²⁸¹⁷ is an apocalyptic number.

It is an amenable number.

442817 is a deficient number, since it is larger than the sum of its proper divisors (1).

442817 is an equidigital number, since it uses as much as digits as its factorization.

442817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1792, while the sum is 26.

The square root of 442817 is about 665.4449639151. Note that the first 3 decimals coincide. The cubic root of 442817 is about 76.2210209685.

The spelling of 442817 in words is "four hundred forty-two thousand, eight hundred seventeen".