423824 has 10 divisors (see below), whose sum is σ = 821190. Its totient is φ = 211904.

The previous prime is 423823. The next prime is 423847. The reversal of 423824 is 428324.

It can be written as a sum of positive squares in only one way, i.e., 313600 + 110224 = 560^2 + 332^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 423824.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13229 + ... + 13260.

It is an arithmetic number, because the mean of its divisors is an integer number (82119).

2⁴²³⁸²⁴ is an apocalyptic number.

It is an amenable number.

423824 is a deficient number, since it is larger than the sum of its proper divisors (397366).

423824 is a wasteful number, since it uses less digits than its factorization.

423824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26497 (or 26491 counting only the distinct ones).

The product of its digits is 1536, while the sum is 23.

The square root of 423824 is about 651.0176648909. The cubic root of 423824 is about 75.1153188928.

Subtracting from 423824 its sum of digits (23), we obtain a square (423801 = 651²).

The spelling of 423824 in words is "four hundred twenty-three thousand, eight hundred twenty-four".