423445663 has 16 divisors (see below), whose sum is σ = 455196672. Its totient is φ = 392920000.

The previous prime is 423445661. The next prime is 423445681. The reversal of 423445663 is 366544324.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 423445663 - 2¹ = 423445661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423445661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 178938 + ... + 181288.

It is an arithmetic number, because the mean of its divisors is an integer number (28449792).

Almost surely, 2^423445663 is an apocalyptic number.

423445663 is a deficient number, since it is larger than the sum of its proper divisors (31751009).

423445663 is a wasteful number, since it uses less digits than its factorization.

423445663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2606.

The product of its digits is 207360, while the sum is 37.

The square root of 423445663 is about 20577.7953872615. The cubic root of 423445663 is about 750.9296105488.

Adding to 423445663 its reverse (366544324), we get a palindrome (789989987).

The spelling of 423445663 in words is "four hundred twenty-three million, four hundred forty-five thousand, six hundred sixty-three".