423565 has 4 divisors (see below), whose sum is σ = 508284. Its totient is φ = 338848.

The previous prime is 423559. The next prime is 423581. The reversal of 423565 is 565324.

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 248004 + 175561 = 498^2 + 419^2 .

It is a cyclic number.

It is not a de Polignac number, because 423565 - 2³ = 423557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 42352 + ... + 42361.

It is an arithmetic number, because the mean of its divisors is an integer number (127071).

2⁴²³⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

423565 is a deficient number, since it is larger than the sum of its proper divisors (84719).

423565 is an equidigital number, since it uses as much as digits as its factorization.

423565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84718.

The product of its digits is 3600, while the sum is 25.

The square root of 423565 is about 650.8187151581. The cubic root of 423565 is about 75.1000147163.

Adding to 423565 its reverse (565324), we get a palindrome (988889).

The spelling of 423565 in words is "four hundred twenty-three thousand, five hundred sixty-five".