422665 has 4 divisors (see below), whose sum is σ = 507204. Its totient is φ = 338128.

The previous prime is 422657. The next prime is 422689. The reversal of 422665 is 566224.

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 95481 + 327184 = 309^2 + 572^2 .

It is a cyclic number.

It is not a de Polignac number, because 422665 - 2³ = 422657 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42262 + ... + 42271.

It is an arithmetic number, because the mean of its divisors is an integer number (126801).

2⁴²²⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

422665 is a deficient number, since it is larger than the sum of its proper divisors (84539).

422665 is an equidigital number, since it uses as much as digits as its factorization.

422665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84538.

The product of its digits is 2880, while the sum is 25.

The square root of 422665 is about 650.1269106874. The cubic root of 422665 is about 75.0467856235.

Adding to 422665 its reverse (566224), we get a palindrome (988889).

The spelling of 422665 in words is "four hundred twenty-two thousand, six hundred sixty-five".