423728 has 20 divisors (see below), whose sum is σ = 834768. Its totient is φ = 208320.

The previous prime is 423727. The next prime is 423749. The reversal of 423728 is 827324.

It is a junction number, because it is equal to n+sod(n) for n = 423697 and 423706.

It is not an unprimeable number, because it can be changed into a prime (423727) 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, 950 + ... + 1322.

2⁴²³⁷²⁸ is an apocalyptic number.

It is an amenable number.

423728 is a deficient number, since it is larger than the sum of its proper divisors (411040).

423728 is a wasteful number, since it uses less digits than its factorization.

423728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452 (or 446 counting only the distinct ones).

The product of its digits is 2688, while the sum is 26.

The square root of 423728 is about 650.9439299970. The cubic root of 423728 is about 75.1096470297.

It can be divided in two parts, 4 and 23728, that added together give a palindrome (23732).

The spelling of 423728 in words is "four hundred twenty-three thousand, seven hundred twenty-eight".