423660 has 48 divisors (see below), whose sum is σ = 1241856. Its totient is φ = 107712.

The previous prime is 423649. The next prime is 423667. The reversal of 423660 is 66324.

423660 is a nontrivial binomial coefficient, being equal to C(921, 2).

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

423660 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1227 + ... + 1533.

It is an arithmetic number, because the mean of its divisors is an integer number (25872).

2⁴²³⁶⁶⁰ is an apocalyptic number.

423660 is the 920-th triangular number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 423660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (620928).

423660 is an abundant number, since it is smaller than the sum of its proper divisors (818196).

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

423660 is a wasteful number, since it uses less digits than its factorization.

423660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342 (or 340 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 423660 is about 650.8916960601. The cubic root of 423660 is about 75.1056289416.

Adding to 423660 its reverse (66324), we get a palindrome (489984).

The spelling of 423660 in words is "four hundred twenty-three thousand, six hundred sixty".