423920 has 40 divisors (see below), whose sum is σ = 1127904. Its totient is φ = 145152.

The previous prime is 423887. The next prime is 423931. The reversal of 423920 is 29324.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 423892 and 423901.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182 + ... + 938.

2⁴²³⁹²⁰ is an apocalyptic number.

423920 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 423920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (563952).

423920 is an abundant number, since it is smaller than the sum of its proper divisors (703984).

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

423920 is a wasteful number, since it uses less digits than its factorization.

423920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777 (or 771 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 423920 is about 651.0913914344. The cubic root of 423920 is about 75.1209898995.

The spelling of 423920 in words is "four hundred twenty-three thousand, nine hundred twenty".