422509 has 4 divisors (see below), whose sum is σ = 423900. Its totient is φ = 421120.

The previous prime is 422479. The next prime is 422537. The reversal of 422509 is 905224.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 260100 + 162409 = 510^2 + 403^2 .

It is a cyclic number.

It is not a de Polignac number, because 422509 - 2⁹ = 421997 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 422509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (422549) 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, 22 + ... + 919.

It is an arithmetic number, because the mean of its divisors is an integer number (105975).

2⁴²²⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

422509 is a deficient number, since it is larger than the sum of its proper divisors (1391).

422509 is an equidigital number, since it uses as much as digits as its factorization.

422509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1390.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 422509 is about 650.0069230401. The cubic root of 422509 is about 75.0375515656.

The spelling of 422509 in words is "four hundred twenty-two thousand, five hundred nine".