423980 has 48 divisors (see below), whose sum is σ = 997920. Its totient is φ = 150528.

The previous prime is 423977. The next prime is 423989. The reversal of 423980 is 89324.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423989) 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, 9839 + ... + 9881.

It is an arithmetic number, because the mean of its divisors is an integer number (20790).

2⁴²³⁹⁸⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 423980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (498960).

423980 is an abundant number, since it is smaller than the sum of its proper divisors (573940).

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

423980 is a wasteful number, since it uses less digits than its factorization.

423980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98 (or 96 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 423980 is about 651.1374662850. The cubic root of 423980 is about 75.1245338439.

The spelling of 423980 in words is "four hundred twenty-three thousand, nine hundred eighty".