423205660 has 12 divisors (see below), whose sum is σ = 888731928. Its totient is φ = 169282256.

The previous prime is 423205637. The next prime is 423205669. The reversal of 423205660 is 66502324.

It is a happy number.

It is a super-3 number, since 3×423205660³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423205669) 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, 10580122 + ... + 10580161.

It is an arithmetic number, because the mean of its divisors is an integer number (74060994).

Almost surely, 2^423205660 is an apocalyptic number.

It is an amenable number.

423205660 is an abundant number, since it is smaller than the sum of its proper divisors (465526268).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

423205660 is a wasteful number, since it uses less digits than its factorization.

423205660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21160292 (or 21160290 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 423205660 is about 20571.9629593289. The cubic root of 423205660 is about 750.7877116501.

Adding to 423205660 its reverse (66502324), we get a palindrome (489707984).

The spelling of 423205660 in words is "four hundred twenty-three million, two hundred five thousand, six hundred sixty".