442807 has 2 divisors, whose sum is σ = 442808. Its totient is φ = 442806.

The previous prime is 442789. The next prime is 442817. The reversal of 442807 is 708244.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-442807 is a prime.

It is a d-powerful number, because it can be written as 4² + 4⁹ + 8⁵ + 2¹⁷ + 0 + 7⁵ .

442807 is a lucky number.

It is a nialpdrome in base 14.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (442817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221403 + 221404.

It is an arithmetic number, because the mean of its divisors is an integer number (221404).

2⁴⁴²⁸⁰⁷ is an apocalyptic number.

442807 is a deficient number, since it is larger than the sum of its proper divisors (1).

442807 is an equidigital number, since it uses as much as digits as its factorization.

442807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 442807 is about 665.4374501033. The cubic root of 442807 is about 76.2204472055.

The spelling of 442807 in words is "four hundred forty-two thousand, eight hundred seven".