442509 has 4 divisors (see below), whose sum is σ = 590016. Its totient is φ = 295004.

The previous prime is 442501. The next prime is 442517. The reversal of 442509 is 905244.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (442501) and next prime (442517).

It is a cyclic number.

It is not a de Polignac number, because 442509 - 2³ = 442501 is a prime.

It is a D-number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 442509.

It is not an unprimeable number, because it can be changed into a prime (442501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73749 + ... + 73754.

It is an arithmetic number, because the mean of its divisors is an integer number (147504).

2⁴⁴²⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

442509 is a deficient number, since it is larger than the sum of its proper divisors (147507).

442509 is a wasteful number, since it uses less digits than its factorization.

442509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147506.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 442509 is about 665.2134995624. The cubic root of 442509 is about 76.2033451043.

The spelling of 442509 in words is "four hundred forty-two thousand, five hundred nine".