442687 has 4 divisors (see below), whose sum is σ = 505936. Its totient is φ = 379440.

The previous prime is 442633. The next prime is 442691. The reversal of 442687 is 786244.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-442687 is a prime.

It is a Duffinian number.

442687 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442487) 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 in 3 ways as a sum of consecutive naturals, for example, 31614 + ... + 31627.

It is an arithmetic number, because the mean of its divisors is an integer number (126484).

2⁴⁴²⁶⁸⁷ is an apocalyptic number.

442687 is a deficient number, since it is larger than the sum of its proper divisors (63249).

442687 is an equidigital number, since it uses as much as digits as its factorization.

442687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63248.

The product of its digits is 10752, while the sum is 31.

The square root of 442687 is about 665.3472777430. The cubic root of 442687 is about 76.2135613764.

The spelling of 442687 in words is "four hundred forty-two thousand, six hundred eighty-seven".