422688509 has 4 divisors (see below), whose sum is σ = 422787804. Its totient is φ = 422589216.

The previous prime is 422688491. The next prime is 422688529. The reversal of 422688509 is 905886224.

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

It can be written as a sum of positive squares in 2 ways, for example, as 243048100 + 179640409 = 15590^2 + 13403^2 .

It is a cyclic number.

It is not a de Polignac number, because 422688509 - 2¹⁶ = 422622973 is a prime.

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 422688509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (422688529) 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, 42962 + ... + 51875.

It is an arithmetic number, because the mean of its divisors is an integer number (105696951).

Almost surely, 2^422688509 is an apocalyptic number.

It is an amenable number.

422688509 is a deficient number, since it is larger than the sum of its proper divisors (99295).

422688509 is an equidigital number, since it uses as much as digits as its factorization.

422688509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99294.

The product of its (nonzero) digits is 276480, while the sum is 44.

The square root of 422688509 is about 20559.3898012563. The cubic root of 422688509 is about 750.4817698715.

The spelling of 422688509 in words is "four hundred twenty-two million, six hundred eighty-eight thousand, five hundred nine".