423665 has 8 divisors (see below), whose sum is σ = 554688. Its totient is φ = 308080.

The previous prime is 423649. The next prime is 423667. The reversal of 423665 is 566324.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 423665 - 2⁴ = 423649 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 423665.

It is not an unprimeable number, because it can be changed into a prime (423667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3797 + ... + 3906.

It is an arithmetic number, because the mean of its divisors is an integer number (69336).

2⁴²³⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

423665 is a deficient number, since it is larger than the sum of its proper divisors (131023).

423665 is a wasteful number, since it uses less digits than its factorization.

423665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7719.

The product of its digits is 4320, while the sum is 26.

The square root of 423665 is about 650.8955369335. The cubic root of 423665 is about 75.1059244039.

Adding to 423665 its reverse (566324), we get a palindrome (989989).

The spelling of 423665 in words is "four hundred twenty-three thousand, six hundred sixty-five".